ST ST16C32245 User Manual

Features

ST16C32245

14-bit dual supply bus transceiver level translator

A side series resistor, 2-bit I

2

C lines

■ High speed: t

V

= 3.0 V and V

CCA

■ Low power dissipation:

I

= I

CCA

■ Symmetrical output impedance:

|I (V |I (V

■ Balanced propagation delays: t

■

Power down protection on inputs and outputs

■ 26 Ω series resistor on A side outputs

■ Operating voltage range:

V V

■ Fast I

CCB

| = I

OHA

OHB

CCA

CCB

OLA

= 3.0 V; V

CCA

| = I

OLB

= 1.65 V V

CCB

(opr) = 2.3 V to 3.6 V

(opr) = 1.65 V to 2.7 V

2

C lines 1.8 V/2.8 V level translator:

400 KHz guaranteed data rate at C

■ Bus hold provided on data input both side

■ Latch-up performance exceeds 500mA

= 4.4 ns (max) at TA = 85 °C

PD

CCB

= 2.3 V

= 20 μA(max) at TA = 85 °C

= 8 mA min

= 1.65 V or 2.3 V)

CCB

= 6 mA min

= 3.0 V; )

CCA

≅ t

PLH

PHL

= 15 pF

L

(JESD 17)

■ ESD performance:

HBM > 2000 V (MIL STD 883 method 3015); MM > 200 V

Table 1. Device summary

μTFBGA42

Description

The ST16C32245 is a dual supply low voltage CMOS 14-bit bus transceiver fabricated with submicron silicon gate and five-layer metal wiring

2

C

MOS technology. Designed for use as an

interface between a 3.3 V bus and a 2.5 V or

1.8 V bus in a mixed 3.3 V/1.8 V,3.3 V/2.5 V and

2.5 V/1.8 V supply systems, it achieves high speed operation while maintaining the CMOS low power dissipation and it includes 2-bit I translation. This IC is intended for two-way asynchronous communication between data buses and the direction of data transmission is determined by nDIR inputs. The enable inputs nG can be used to disable the device so that the buses are effectively isolated. The A-port interfaces with the 3 V bus, the B-port with the

2.5 V and 1.8 V bus. All inputs are equipped with protection circuits against static discharge, giving them 2 KV ESD immunity and transient excess voltage. All floating bus terminals during high Z state do not need external pull-up or pull-down resistor.

2

C level

Order code Package Packaging

ST16C32245TBR μTFBGA42 Tape and reel

March 2009 Rev 3 1/23

www.st.com

23

Contents ST16C32245

Contents

1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 I2C bus function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

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ST16C32245 General description

1 General description

Figure 1. Logic diagram

3/23

General description ST16C32245

Figure 2. Input and output equivalent circuit

4/23

ST16C32245 Pin settings

2 Pin settings

2.1 Pin connection

Figure 3. Pin connection (top through view)

Table 2. Pin description

Pin number

B3 1DIR Directional controls

F3 2DIR Directional controls

A4, A5, A6, B5, B6, C5, C6, D5

D6, E5, E6,

F5, F6, G6

A3, A2, A1, B2, B1, C2, C1, D2

D1, E2, E1,

F2, F1, G1

F4 2G

B4 1G

C3, C4, E3, E4 GND Ground (0V)

- NC No connected

D4

D3

μTFBGA42

Symbol Name and function

A1, A2, A3, A4,

A5, A6, A7, A8

A9, A10, A11,

A12, A13, A14

B1, B2, B3, B4,

B5, B6, B7, B8

B9, B10, B11,

B12, B13, B14

V

CCA

V

CCB

Data Inputs/outputs

Output enable inputs

Positive supply voltage

G5, G4

G2, G3

I/O

VA1

VB1

, I/O

VA2

VB2

I2C Line (V

CCA

CCB

referred)

5/23

Pin settings ST16C32245

Table 3. Truth table

Inputs Function

G

DIR A bus B bus

L L Output Input A = B

L H Input Output B = A

HXZ Z Z

Output

Note: X = don’t care; Z = high Impedance

2.2 I2C bus function

Table 4. I2C Bus function table

2G 1G, 1DIR, 2DIR

I/O

HXZ Z

LXLL

VA

I/O input

I/O

VB

Function

2

C disabled

I

2

C comm.

I

LXV

LXOpenV

LXV

Note: Open: If I/O

up resistor. If I/O pull-up resistor.

CCA

is not driven then the I/OVB goes in high level V

VA

is not driven then the I/OVA will go in high level V

VB

V

CCB

Open

by embedded 10 kΩ pull-

CCB

by embedded 10 kΩ

CCB

I2C comm.

2

C comm.

I

6/23

ST16C32245 Maximum rating

3 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.

Table 5. Absolute maximum ratings

Symbol Parameter Value Unit

V

I

T

I/OVA

I/OVB

I

CCA

CCB

P

T

Supply voltage -0.5 to +4.6 V

CCA

Supply voltage -0.5 to +4.6 V

CCB

V

DC input voltage -0.5 to +4.6 V

I

DC I/O voltage (Output disabled) -0.5 to +4.6 V

I/OA

DC I/O voltage (Output disabled) -0.5 to +4.6 V

I/OB

DC I/O voltage -0.5 to V

I/OA

DC I/O voltage -0.5 to V

I/OB

Level input voltage (I/OVA) -0.5 to V

Level input voltage (I/OVB) -0.5 to V

I

DC input diode current − 20 mA

IK

DC output diode current − 50 mA

OK

DC output current ± 50 mA

OA

DC output current ± 50 mA

OB

CCA

CCB

CCA

CCB

DC VCC or ground current ± 100 mA

Power dissipation 400 mW

d

Storage temperature -65 to +150 °C

stg

Lead temperature (10 sec) 260 °C

L

+ 0.5 V

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