ST ST2189 User Manual

Features

ST2189

8-bit dual supply level translator without direction control pin

■ 46 MHz: 92 Mbps data transfer when V

CCA

=

3.6 V

■ Bidirectional level translation without direction

control pin

■ Wide voltage range of 1.65 V to 3.6 V for both

V

and V

CCA

■

Configurable voltage translation: –V

CCA

■

Partial power down support - when V

CCB

can be ≥ V

CCB

or V

can be ≤ V

CCA

CCB

is grounded, all the outputs will automatically go to high impedance.

■ Low quiescent current (5 µA)

■ ESD performance:

– ±4 kV HBM (human body model)

Applications

■ Low voltage system level translation

■ Mobile phones

■ Other mobile devices

QFN20

(1.8 x 3.2 mm)

Description

The ST2189 is an 8-bit dual supply level translator which provides the level shifting capability to allow data transfer in a multi-voltage system. Externally applied voltages, V levels on either side of the device. Its architecture allows bidirectional level translation without a control pin.

CCB

and V

, set the logic

CCA

The ST2189 accepts V and V

from 1.65 V to 3.6 V, making it ideal for

CCB

from 1.65 V to 3.6 V

CCA

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

In power down mode feature - when V

CCB

supply is grounded, all I/Os go to high impedance automatically, with very low quiescent current on V

supply.

CCA

Table 1. Device summary

Order code Package Packing

ST2189QTR QFN20 (3.2 x 1.8 mm) Tape and reel

August 2009 Doc ID 15918 Rev 1 1/21

www.st.com

21

Pin settings ST2189

1 Pin settings

1.1 Pin connection

Figure 1. Pin connection (top through view)

1.2 Pin description

Table 2. Pin description

Pin number Type Side Symbol Name and function

1 I/O V

2 I/O V

3 I/O V

4 I/O V

5-V

6-V

7 I/O V

CCA

V

A1

A2

A3

A4

OE

CCA

A5

Input/output 1. Referenced to V

CCA

Input/output 2. Referenced to V

CCA

Input/output 3. Referenced to V

CCA

Input/output 4. Referenced to V

CCA

Output enabled. Pull OE low to put all output to tri-state mode. Referenced to V

A port supply voltage. V V

or V

CCB

CCA

≥ V

CCB

CCA

≤

Input/output 5. Referenced to V

CCA

2/21 Doc ID 15918 Rev 1

ST2189 Pin settings

Table 2. Pin description (continued)

Pin number Type Side Symbol Name and function

8 I/O V

9 I/O V

10 I/O V

11 I/O V

12 I/O V

13 I/O V

14 I/O V

15 - V

CCA

CCB

V

A6

A7

A8

B8

B7

B6

B5

CCB

Input/output 6. Referenced to V

CCA

Input/output 7. Referenced to V

CCA

Input/output 8. Referenced to V

CCA

Input/output 8. Referenced to V

CCB

Input/output 7. Referenced to V

CCB

Input/output 6. Referenced to V

CCB

Input/output 5. Referenced to V

CCB

B port supply voltage. V

or V

V

CCA

16 - - GND Ground

17 I/O V

18 I/O V

19 I/O V

20 I/O V

CCB

B4

B3

B2

B1

Input/output 4. Referenced to V

CCB

Input/output 3. Referenced to V

CCB

Input/output 2. Referenced to V

CCB

Input/output 1. Referenced to V

CCB

≤ V

CCA

CCB

≥

Doc ID 15918 Rev 1 3/21

Logic diagram ST2189

2 Logic diagram

Figure 2. Logic block diagram

4/21 Doc ID 15918 Rev 1

ST2189 Logic diagram

2.1 Device block diagram

Figure 3. ST2189 block diagram

Figure 4. Application block diagram

Doc ID 15918 Rev 1 5/21

Supplementary notes ST2189

3 Supplementary notes

3.1 Driver requirement

It must be ensured that the driver is able to source and sink a minimum of 1mA current on both sides of the device. The device requires the driver to source/sink a maximum current of (V

/4) mA to/from the weak 4 kΩ output buffer in order to change the state of the output.

CC

3.2 Load driving capability

To support the level translation without direction pin architecture, the one-shot transistor at the output side is only turned ON during state transition. After the one-shot transistor is turned OFF, only the 4 kΩ pull-up/down resistor maintains the state of the output. As a result, resistive load or pull-up resistor less than 50 kΩ is not recommended.

3.3 Ensuring low current consumption during off state

The OE pin can be tied to the enable signal which is driving the enable pin of the slave device to ensure that the device will turn off and put all I/Os to tri-state mode whenever the slave device is not needed. On the event that the enable signal driving into the slave device is active low, the signal going into the OE pin for ST2189 (active high) needs to be inverted accordingly.

Alternatively, a pull-down resistor can be added to the V V

supply does not float whenever the supply is turned off. All the I/Os go to high

CCB

impedance automatically when this happens.

3.4 Truth table

Table 3. Truth table

Enable Bidirectional Input/Output

OE I/O

H

1. High level V

2. High level V

3. Z = High impedance.

CCA

CCB

VCCB

(1)

L High-Z

power supply referred.

(2)

H

LL

(3)

supply. This will ensure that the

CCB

I/O

VCCA

(1)

H

(3)

High-Z

6/21 Doc ID 15918 Rev 1

ST2189 Maximum ratings

4 Maximum ratings

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.

Table 4. Absolute maximum ratings

Symbol Parameter Value Unit

V

CCA

V

CCB

V

I/OVCCA

V

I/OVCCB

I

I/OVCCA

I

I/OVCCB

T

STG

T

Supply voltage -0.3 to 4.6 V

DC control intput voltage -0.3 to 4.6 V

OE

DC I/O

DC input diode current -20 mA

IK

input voltage (OE = GND or V

VCCA

input voltage (OE = GND or V

VCCB

CCA

DC output current ±25 mA

Storage temperature -65 to 150 °C

Lead temperature (10 seconds) 300 °C

L

ESD Electrostatic discharge protection (HBM) ±4 kV

4.1 Recommended operating conditions

Table 5. Recommended operating conditions

Symbol Parameter Min. Type Max. Unit

V

CCA

V

CCB

V

I/OVCCA

V

I/OVCCB

T

OP

dt/dV Input rise and fall time - - 1 ns/V

Supply voltage 1.65 - 3.6 V

Input voltage (OE output enable

I

pin,V

I/O

power supply reference)

CCA

voltage 0 - V

VCCA

voltage 0 - V

VCCB

0-V

Operating temperature -40 - 85 °C

) -0.3 to 4.6 V

CCA

CCB

V

Doc ID 15918 Rev 1 7/21