Datasheet ST2349 Datasheet (ST)

Features

■ 90 Mbps (max) data rate when driven by a

totem pole driver

■ 8 Mbps (max) data rate when driven by an

open drain pole driver

■ Bi-directional level translation without

direction control pin

■ Wide V

■ Power down mode feature – when either

supply is off, all I/Os are in high impedance

■ Low quiescent current (max 24 µA)

■ Able to be driven by totem pole and open drain

drivers

■ 5.5 V tolerant enable pin

■ ESD performance on all pins: ±2 kV HBM

■ Small package and footprint

QFN16 (2.6 x 1.8 mm) package

voltage range of 1.65 to 3.6 V

L

voltage range of 1.80 to 5.5 V

CC

ST2349

4-bit dual supply level translator

without direction control pin

QFN16L

(2.6 x 1.8 mm)

Description

The ST2349 is a 4-bit dual supply level translator which provides the level shifting capability to allow data transfer in a multi-voltage system. Externally applied voltages, V on either side of the device. It utilizes transmission gate-based design that allows bidirectional level translation without a control pin.

and VL, set the logic levels

CC

Applications

■ Low voltage system level translation

■ Mobile phones and other mobile devices

2

■ I

C level translation

■ UART level translation

The ST2349 accepts a V V

from 1.80 to 5.5 V, making it ideal for data

CC

transfer between low-voltage ASICs/PLD and higher voltage systems. This device has a tri-state output mode which can be used to disable all I/Os.

The ST2349 supports power down mode when V

is grounded/floating and the device is

CC

from 1.65 to 3.6 V and

L

disabled via the OE pin.

Table 1. Device summary

Order code Package Packaging

ST2349QTR QFN16 (2.6 x 1.8 mm) Tape and reel (3000 parts per reel)

May 2008 Rev 4 1/23

www.st.com

23

Contents ST2349

Contents

1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Device block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Supplementary notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Driver requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Load driving capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 Power off feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.4 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1 AC characteristics (device driven by open drain driver) . . . . . . . . . . . . . . 11

5.2 AC characteristics (device driven by totem pole driver ) . . . . . . . . . . . . . 13

6 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2/23

ST2349 List of figures

List of figures

Figure 1. ST2349 pin connection (top through view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. ST2349 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. Application block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4. Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 5. Waveform - propagation delay (f = 1 MHz; 50% duty cycle). . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 6. Waveform - output enable and disable time (f = 1 MHz; 50% duty cycle) . . . . . . . . . . . . . 17

Figure 7. QFN16L (2.6 x 1.8 mm) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 8. QFN16L (2.6 x 1.8 mm) footprint recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 9. QFN16L (2.6 x 1.8 mm) carrier tape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 10. QFN16L (2.6 x 1.8 mm) reel information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3/23

List of tables ST2349

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. ST2349 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 3. Truth table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 5. Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 6. DC characteristics (over recommended operating conditions unless otherwise noted. All typ-

ical values are at T

Table 7. AC characteristics - test conditions: V

tr = tf ≤ 2 ns) over temperature range -40 °C to 85 °C11

Table 8. AC characteristics - test conditions: V

tr = tf ≤ 2 ns) over temperature range -40 °C to 85 °C11

Table 9. AC characteristics - test conditions: V

tr = tf ≤ 2 ns) over temperature range -40 °C to 85 °C12

Table 10. AC characteristics (test conditions: V

tr = tf ≤ 2 ns) over temperature range -40 °C to 85 °C)13

Table 11. AC characteristics (test conditions: V

tr = tf ≤ 2 ns) over temperature range -40 °C to 85 °C)13

Table 12. AC characteristics (test conditions: V

tr = tf ≤ 2 ns) over temperature range -40 °C to 85 °C)14

Table 13. Test circuit switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 14. Waveform symbol value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 15. QFN16L (2.6 x 1.8 mm) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 16. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

= 25 oC)

A

= 1.65 - 1.8 V (load CL=15pF; Rup=4.7kΩ; driver

L

= 2.5 - 2.7 V (load CL=15pF; Rup=4.7kΩ; driver

L

= 2.7 - 3.6 V (load CL=15pF; Rup=4.7kΩ; driver

L

= 1.65 - 1.8 V (load CL=15pF; Rup=10kΩ; driver

L

= 2.5 - 2.7 V (load CL=15pF; Rup=10kΩ; driver

L

= 2.7 - 3.6 V (load CL=15pF; Rup=10kΩ; driver

L

4/23

ST2349 Pin settings

1 Pin settings

1.1 Pin connection

Figure 1. ST2349 pin connection (top through view)

1.2 Pin description

Table 2. ST2349 pin description

Pin number Symbol Name and function

1I/O

2 OE Output enable

3I/O

4I/O

5 NC No connection

6V

7V

8 NC No connection

9 I/O

10 I/O

11 GND Ground

I/O

VL2

OE

VL3

VL4

L

VL2

VL3

VL4

CC

VCC1

13 14 15 16

I/O

12

VCC2

11

GND

I/O

10

VCC3

9

O/I

VCC4

8

7

NC

CC

V

CS00022

Data input/output

L

Supply voltage

Data input/output

VL1

I/O

VL VCC I/O

1

2

3

4

5

6

V

NC

VCC4

VCC3

12 I/O

13 I/O

14 V

15 V

16 I/O

5/23

VCC2

VCC1

CC

L

VL1

Data input/output

Supply voltage

Data input/output

Device block diagrams ST2349

2 Device block diagrams

Figure 2. ST2349 block diagram

ST2349

VL

OE

I/O

VL

EN

VL

VCC

I/O

VCC

GND

* ST2349 has 4 channels. For simplicity, the above diagram shows only 1 channel.

* When OE is low, all I/Os are in high-impedance mode.

Figure 3. Application block diagram

V

L

0.1

μ

F

VL

system

controller

V

L VL

L

OE

I/O I/O

I/O

GND

VCCVCCVCCV

V

L

CC

I/O

VL1

VCC1

I/O

VL2

VCC2

I/O

VL3

VCC3

I/O

VCC4

VL4

CC

= one-shot circuit

CC

V

system

controller

0.1 μF

1μF

CS00021

V

CD00023

CC

6/23

ST2349 Supplementary notes

3 Supplementary notes

3.1 Driver requirement

The ST2349 may be driven by an open drain or totem pole driver and the nature of the

device’s output is “open drain”. It must not be used to drive a pull-down resistor since the

impedance of the output at HIGH state depends on the pull-up resistor placed at the I/Os.

As the device has pull-up resistors on both the I/O

ensure that the driver is able to sink the required amount of current. For example, if the

settings are V

=5.5V, VL= 4.3 V and the pull-up resistor is 10 kΩ, then the driver must be

CC

able to sink at least (5.5 V/10 kΩ) + (4.3 V/10 kΩ)

requirements of the ST2349.

3.2 Load driving capability

To support the open drain system, the one-shot transistor is turned on only during state

transition at the output side. When it drives a high state, after the one-shot transistor is

turned off, only the pull-up resistor is able to maintain the state. In this case, the resistive

load is not recommended.

During the translation from V

side to VL side, the oscillation might be triggered when the

CC

signal is reflected back as a glitch. This is caused by the architecture of the device (auto-

direction).

When using the ST2349, care need to be taken in the PCB data-track design and output

loading. It is recommended that the load is less than 25 pf.

3.3 Power off feature

In some applications where it might be required to turn off one of the power supplies

powering up the level translator, the user may turn off the V

(device is disabled). There will be no current consumption in V

other causes, and the I/Os are in a high-impedance state in this mode.

and I/OVL ports, the user needs to

VCC

= 1 mA and still meet the V

only when the OE pin is low

CC

due to floating gates or

L

IL

3.4 Truth table

Table 3. Truth table

Enable Bi-directional Input/Output

OE I/O

(1)

H

(1)

H

L Z

1. High level VL power supply referred

2. High level VCC power supply referred

3. Z = high impedance

VCC

(2)

H

L L

(3)

7/23

I/O

H

Z

(1)

(3)

VL

Maximum rating ST2349

4 Maximum rating

Stressing the device above the rating listed in the “Absolute maximum ratings” table may

cause permanent damage to the device. These are stress ratings only, and operation of the

device at these or any other conditions above those indicated in the operating sections of

this specification is not implied. Exposure to absolute maximum rating conditions for

extended periods may affect device reliability. Refer also to the STMicroelectronics SURE

Program and other relevant quality documents.

Table 4. Absolute maximum ratings

Symbol Parameter Value Unit

V

Supply voltage -0.3 to 4.6 V

L

V

I/OVL

V

I/OVCC

I

I/OVL

I

I/OVCC

I

SCTOUT

P

T

ESD Electrostatic discharge protection (HBM) ±2 kV

Supply voltage -0.3 to 6.5 V

CC

DC control input voltage -0.3 to 6.5 V

OE

DC I/OVL input voltage (OE = GND or VL) -0.3 to VL + 0.3 V

DC I/O

DC input diode current -20 mA

I

IK

input voltage (OE = GND or VL) -0.3 to VCC + 0.3 V

VCC

DC output current ±25 mA

DC output current ±258 mA

Short circuit duration, continuous 40 mA

Power dissipation

D

Storage temperature -65 to 150

STG

(1)

500 mW

TL Lead temperature (10 seconds) 300

o

C

o

C

1. 500mW: 65oC derated to 300 mW by 10W/oC: 65oC to 85oC

4.1 Recommended operating conditions

Table 5. Recommended operating conditions

Symbol Parameter Min Typ Max Unit

V

CC

V

VI/O

T

dt/dV Input rise and fall time (for 45 Mbps operation) 0 1 ns/V

1. VCC must be greater than VL.

8/23

Supply voltage 1.65 3.6 V

L

(1)

Supply voltage 1.8 5.5 V

Input voltage

OE

(OE output enable pin, VL power supply referred)

I/OVL voltage 0 V

VL

I/O

VCC

op

voltage 0 V

VCC

Operating temperature -40 85

03.6V

L

CC

V

o

C

ST2349 Electrical characteristics

5 Electrical characteristics

Table 6. DC characteristics (over recommended operating conditions unless otherwise noted. All

typical values are at T

= 25 oC)

A

Test conditions Value

Symbol Parameter

TA = 25oC-40 to 85

V

L

V

CC

o

Unit

C

Min Typ Max Min Max

1.65

1.4 1.4

2.0 1.6 1.6

IHL

High level input voltage (I/O

VL

V

L

to 5.5

2.5 2.0 2.0

)

V

3.0 2.4 2.4

3.6 2.8 2.8

1.65

0.3 0.3

2.0 0.4 0.4

ILL

Low level input voltage (I/O

VL

V

2.5 0.5 0.5

)

V

L

to 5.5

V

3.0 0.6 0.6

3.6 0.8 0.8

1.8 1.6 1.6

2.5 2.3 2.3

High level input

IHC

voltage (I/O

VCC

)

V

1.65 to V

CC

3.0 2.7 2.7

3.6 3.3 3.3

V

4.3 3.5 3.5

V

ILC

IH-OE

IL-OE

Low level input voltage (I/O

)

VCC

High level input voltage (OE)

Low level input voltage (OE)

5.5 4.2 4.2

1.65 -

2.5

2.7 -

3.6

1.65

3 - 5.5 0.3

3.6 - 5.5 0.5

1.0 1.0

2.0 1.2 1.2

V

L

to 5.5

2.5 1.4 1.4

3.0 1.6 1.6

3.6 2.0 2.0

1.65

0.33 0.33

2.0 0.40 0.40

V

2.5 0.50 0.50

to 5.5

L

3.0 0.60 0.60

3.6 0.75 0.75

9/23

V

Electrical characteristics ST2349

Table 6. DC characteristics (over recommended operating conditions unless otherwise noted. All

typical values are at T

= 25 oC) (continued)

A

Test conditions Value

Symbol Parameter

Low level

V

OLL

output voltage

)

(I/O

VL

Low level

V

OLC

output voltage

)

(I/O

VCC

Control input

I

OE

leakage current (OE)

High

I

IO_LKG

impedance leakage current

, I/O

(I/O

VL

VCC

Quiescent

I

QVCC

supply current V

CC

Quiescent

I

QVL

supply current V

L

High impedance

I

Z-VCC

quiescent supply current V

CC

High impedance

I

Z-VL

quiescent supply current V

L

)

V

L

1.65 to

3.6

1.65 to

3.6

1.65 to

3.6

1.65 to

3.6

1.65 to

3.6

1.65 to

3.6

1.65 to

3.6

1.65 to

3.6

TA = 25 oC-40 to 85 oC

V

CC

Min Typ Max Min Max

VL to 5.5

to 5.5

V

L

V

to 5.5 OE = GND ±0.1 ±0.1 µA

L

IO = 1.0 mA I/O

≤ 0.15 V

VCC

IO = 1.0 mA I/OVL ≤ 0.15 V

= GND or

V

OE

V

L

0.40 0.40 V

±0.1 ±0.1 µA

only pull-up

V

L

to 5.5

resistor

610 24µA

connected to I/O

only pull-up

V

L

to 5.5

resistor

0.01 0.1 1 µA

connected to I/O

OE = GND;

V

L

to 5.5

only pull-up resistor

610 24µA

connected to I/O

OE = GND;

V

L

to 5.5

only pull-up resistor

0.01 0.1 1 µA

connected to I/O

Unit

10/23

ST2349 Electrical characteristics

5.1 AC characteristics (device driven by open drain driver)

Table 7. AC characteristics - test conditions: VL = 1.65 −1.8 V (load CL=15pF; Rup=4.7kΩ;

Symbol Parameter

driver t

≤ 2 ns) over temperature range -40 °C to 85 °C

r=tf

V

=1.8−2.5 V VCC=2.7−3.6 V

CC

V

CC

=4.3−

5.5 V Unit

Min Max Min Max Min Max

t

RVCC

t

FVCC

t

RVL

t

FVL

t

I/OVL-VCC

t

I/OVCC-VL

t

PZL tPZH

t

PLZ tPHZ

D

1. The data rate is guaranteed based on the condition that the output I/O signal rise/fall time is less than 15% of the input I/O signal period; the input I/O signal is at 50% duty cycle and the output I/O signal duty cycle deviation not less than 30%.

Rise time I/O

Fall time I/O

Rise time I/O

Fall time I/O

Propagation delay time I/O

VL-LH

I/O

VL-HL

Propagation delay time I/O

VCC-LH

I/O

VCC-HL

Output enable and disable time

Data rate

R

VCC

VL

to I/O to I/O

(1)

VCC

VL

VCC-LH

VCC-HL

VL-LH

80 50 30 ns

333ns

766ns

455ns

t

PLH

t

PHL

t

PLH

t

PHL

555ns

577ns

En 10 10 10 ns

Dis 40 40 40 ns

1.6 2.5 4 MHz

Table 8. AC characteristics - test conditions: VL=2.5−2.7 V (load CL=15pF; Rup=4.7kΩ; driver

t

≤ 2 ns) over temperature range -40 °C to 85 °C

r=tf

V

=2.7 −3.6 V VCC=4.3− 5.5 V

Symbol Parameter

t

RVCC

t

FVCC

t

RVL

t

FVL

Rise time I/O

Fall time I/O

Rise time I/O

Fall time I/O

VCC

VL

Propagation delay time

t

I/OVL-VCC

I/O I/O

VL-LH VL-HL

to I/O to I/O

VCC-LH VCC-HL

Propagation delay time

t

I/OVCC-VL

I/O

VCC-LH

I/O

VCC-HL

to I/O to I/O

VL-LH

t

PLH

t

PHL

t

PLH

t

PHL

CC

Unit

Min Max Min Max

70 40 ns

33ns

55ns

33ns

22ns

33ns

44ns

11/23

Electrical characteristics ST2349

Table 8. AC characteristics - test conditions: VL=2.5−2.7 V (load CL=15pF; Rup=4.7kΩ; driver

t

≤ 2 ns) over temperature range -40 °C to 85 °C

r=tf

V

=2.7 −3.6 V VCC=4.3− 5.5 V

Symbol Parameter

CC

Unit

Min Max Min Max

t

PZL tPZH

t

PLZ tPHZ

D

R

1. The data rate is guaranteed based on the condition that the output I/O signal rise/fall time is less than 15% of the input I/O signal period; the input I/O signal is at 50% duty cycle and the output I/O signal duty cycle deviation not less than 30%.

Output enable and disable time

Data rate

(1)

En 6 6 ns

Dis 40 40 ns

2.5 3.2 MHz

Table 9. AC characteristics - test conditions: VL = 2.7 −3.6 V (load CL=15pF; Rup=4.7kΩ; driver

t

≤ 2 ns) over temperature range -40 °C to 85 °C

r=tf

V

= 4.3 − 5.5 V

Symbol Parameter

t

RVCC

t

FVCC

t

RVL

t

FVL

t

I/OVL-VCC

t

I/OVCC-VL

t

PZL tPZH

t

PLZ tPHZ

D

R

1. The data rate is guaranteed based on the condition that the output I/O signal rise/fall time is less than 15% of the input I/O signal period; the input I/O signal is at 50% duty cycle and the output I/O signal duty cycle deviation not less than 30%.

Rise time I/O

Fall time I/O

Rise time I/O

Fall time I/O

VCC

VL

Propagation delay time

VL-LH

VL-HL

to I/O to I/O

VCC-LH

VCC-HL

I/O I/O

Propagation delay time I/O

VCC-LH

I/O

VCC-HL

to I/O to I/O

VL-LH

VL-HL

Output enable and disable time

Data rate

(1)

t

PLH

t

PHL

t

PLH

t

PHL

En 6 ns

Dis 40 ns

CC

Unit

Min Max

55 ns

3ns

4ns

3ns

2ns

4ns

2.8 MHz

12/23

ST2349 Electrical characteristics

5.2 AC characteristics (device driven by totem pole driver )

Table 10. AC characteristics (test conditions: VL=1.65– 1.8 V (load CL=15pF; Rup=10kΩ; driver

t

≤ 2 ns) over temperature range -40 °C to 85 °C)

r=tf

V

=1.8–2.5V VCC=2.7–3.6V VCC=4.3–5.5V

Symbol Parameter

CC

Unit

Min Max Min Max Min Max

t

RVCC

t

FVCC

t

RVL

t

FVL

t

I/OVL-

VCC

t

I/OVCC-

VL

t

PZL tPZH

t

PLZ tPHZ

D

1. The data rate is guaranteed based on the condition that the output I/O signal rise/fall time is less than 15% of the input I/O signal period; the input I/O signal is at 50% duty cycle and the output I/O signal duty cycle deviation not less than 30%.

Table 11. AC characteristics (test conditions: VL=2.5– 2.7 V (load CL=15pF; Rup=10kΩ; driver

Rise time I/O

Fall time I/O

Rise time I/O

Fall time I/O

Propagation delay time I/O

VL-LH

I/O

VL-HL

Propagation delay time I/O

VCC-LH

I/O

VCC-HL

Output enable and disable time

Data rate

R

t

≤ 2 ns) over temperature range -40 °C to 85 °C)

r=tf

VCC

VL

to I/O to I/O

(1)

VCC

VL

VCC-LH

VCC-HL

VL-LH

VL-HL

t

PLH

t

PHL

t

PLH

t

PHL

En 10 10 10 ns

Dis 40 40 40 ns

Symbol Parameter

734ns

733ns

645ns

444ns

654ns

555ns

654ns

4.5 5.2 7 ns

12 32 32 MHz

V

=2.7 − 3.6 V VCC=4.3− 5.5 V

CC

Unit

Min Max Min Max

t

RVCC

t

FVCC

t

RVL

t

FVL

t

I/OVL-VCC

t

I/OVCC-VL

Rise time I/O

Fall time I/O

Rise time I/O

Fall time I/O

VCC

VL

Propagation delay time I/O I/O

VL-LH

VL-HL

to I/O to I/O

VCC-LH

VCC-HL

Propagation delay time I/O

VCC-LH

I/O

VCC-HL

to I/O to I/O

VL-LH

VL-HL

t

PLH

t

PHL

t

PLH

t

PHL

64ns

33ns

55ns

33ns

3.5 3 ns

44ns

ns

2.5 2.1 ns

ns

44

ns

13/23

Electrical characteristics ST2349

Table 11. AC characteristics (test conditions: VL=2.5– 2.7 V (load CL=15pF; Rup=10kΩ; driver

t

≤ 2 ns) over temperature range -40 °C to 85 °C) (continued)

r=tf

V

=2.7 −3.6 V VCC=4.3−5.5 V

Symbol Parameter

CC

Unit

Min Max Min Max

t

PZL tPZH

t

PLZ tPHZ

D

R

1. The data rate is guaranteed based on the condition that the output I/O signal rise/fall time is less than 15% of the input I/O signal period; the input I/O signal is at 50% duty cycle and the output I/O signal duty cycle deviation not less than 30%.

Table 12. AC characteristics (test conditions: VL=2.7– 3.6 V (load CL=15pF; Rup=10kΩ; driver

Output enable and disable time

Data rate

t

r=tf

(1)

≤ 2 ns) over temperature range -40 °C to 85 °C)

Symbol Parameter

En 6 6 ns

Dis 40 40 ns

45 45 MHz

V

=4.3−5.5 V

CC

Unit

Min Max

t

RVCC

t

FVCC

t

RVL

t

FVL

t

I/OVL-VCC

Rise time I/O

Fall time I/O

Rise time I/O

Fall time I/O

VCC

VL

Propagation delay time

VL-LH

VL-HL

to I/O to I/O

VCC-LH

VCC-HL

I/O I/O

t

PLH

PHL

5ns

3ns

4ns

3ns

2.5 ns

4ns

ns

t

Propagation delay time

(1)

to I/O to I/O

VL-LH

VL-HL

t

I/OVCC-VL

t

PZL tPZH

t

PLZ tPHZ

D

R

1. The data rate is guaranteed based on the condition that the output I/O signal rise/fall time is less than 15% of the input I/O signal period; the input I/O signal is at 50% duty cycle and the output I/O signal duty cycle deviation not less than 30%.

I/O

VCC-LH

I/O

VCC-HL

Output enable and disable time

Data rate

PLH

t

PHL

En 6 ns

Dis 40 ns

2

ns

4

ns

45 MHz

14/23

ST2349 Electrical characteristics

Figure 4. Test circuit

V

Pulse

generator

V

CC

V

L

R

up

L

D.U.T

V

CC

V

R

up

C

L

V

CC

OPEN

GND

Table 13. Test circuit switches

Test

Driving I/O

t

PLH

, t

PHL

Open Open Open

VL

Switch

Driving I/O

VCC

CS14021

Open drain driving

15/23

Waveforms ST2349

6 Waveforms

Table 14. Waveform symbol value

2.5 V

V

CC

50% V

Driving I/O

≤

CC

L

Symbol

V

IH

V

IM

V

OM

V

X

V

Y

1.8 V ≤ VL≤ V

2.5 V

V

L

50% V

L

50% V

CC

Driving I/O

CC

VL

≤

3.3 V ≤ VL≤ V

5.0 V

V

50% V

≤

1.8 V ≤ VL≤ V

CC

L

CC

50% V

VOL +0.15V VOL +0.3V VOL +0.15V VOL +0.3V

VOH -0.15V VOH -0.3V VOH -0.15V VOH -0.3V

Figure 5. Waveform - propagation delay (f = 1 MHz; 50% duty cycle)

VCC

3.3V ≤ VL≤ V

5.0 V

V

CC

50% V

CC

50% V

≤

CC

L

16/23

ST2349 Waveforms

Figure 6. Waveform - output enable and disable time (f = 1 MHz; 50% duty cycle)

17/23

Package mechanical data ST2349

7 Package mechanical data

In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Figure 7. QFN16L (2.6 x 1.8 mm) package outline

BOTTOM VIEW

1. Drawing not to scale.

2. Dimensions are in millimeters.

18/23

QFN16L

ST2349 Package mechanical data

Table 15. QFN16L (2.6 x 1.8 mm) mechanical data

Millimeters

Symbol

Typ Min Max

A 0.55 0.45 0.60

A1 0.02 0 0.05

b 0.20 0.15 0.25

D 2.60 2.50 2.70

E 1.80 1.70 1.90

e 0.40

L 0.40 0.35 0.45

Figure 8. QFN16L (2.6 x 1.8 mm) footprint recommentations

1. Drawing not to scale.

2. Dimensions are in millimeters.

7874009

19/23

Package mechanical data ST2349

Figure 9. QFN16L (2.6 x 1.8 mm) carrier tape

20/23

785978-J

ST2349 Package mechanical data

Figure 10. QFN16L (2.6 x 1.8 mm) reel information

1. Drawing not to scale.

2. Dimensions are in millimeters

7875978

21/23

Revision history ST2349

8 Revision history

Table 16. Document revision history

Date Revision Changes

07-May-2007 1 Initial release.

29-May-2007 2 Typo in cover page title.

Removed Data Brief classification from the cover page. Modified title and features section, added the following sections:

26-Nov-2007 3

07-May-2008 4

Section 1: Pin settings, Section 2: Device block diagrams, Section 3: Supplementary notes, Section 4: Maximum rating, Section 5: Electrical characteristicsSection 6: Waveforms and

updated Section 7: Package mechanical data.

Updated data rate values and added paragraph on load driving capability (Section 3.2).

22/23

ST2349

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