ST ST1G3234B User Manual

Features

ST1G3234B

1-bit dual supply bus buffer level translator

with A-side series resistor

■ High speed: t

V

= 1.65 V; V

CCB

■ Low power dissipation:

I

CCA=ICCB

■ Symmetrical output impedance:

|I

|=I

OHA

V

CCA

|I

OHA

V

CCA

■ Balanced propagation delays:

t

PLH

■

Power-down protection on inputs and outputs

■ 26 Ω series resistor on A-side outputs

■ Operating voltage range:

–V
–V

■ Allows partial power-down when V

OLA

= 2.75 V; V

|=I

OLA

= 2.3 V; V

≅ t

PHL

CCA

CCB

= 4.0 ns (max.) at TA=85°C

PD

CCA

= 3.0 V

=5μA (max.) at TA=85°C

= 10 mA min at

= 1.4 to 3.6 V

CCB

= 6 mA min. at

= 1.4 to 3.6 V

CCB

(opr.) = 1.4 to 3.6 V
(opr.) = 1.4 to 3.6 V

CCA

device consumes very low quiescent current

■ Max data rates:

– 380 Mbps (1.8 to 3.3 V translation)
– 260 Mbps (<1.8 to 3.3 V translation)
– 260 Mbps (translates to 2.5 V)
– 210 Mbps (translates to 1.5 V)

■ Latch-up performance exceeds 500 mA

(JESD 17)

■ ESD performance:

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

■ R

HS compliant to Flip-Chip package

O

Table 1. Device summary

=0,

Flip-Chip 5

Description

The ST1G3234B is a dual supply low voltage
CMOS 1-bit bus buffer level translator fabricated
with sub-micron silicon gate and five-layer metal
wiring C
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,

1.8 V/1.4 V and 2.5 V/1.8 V supply systems, it
achieves high speed operation while maintaining
the CMOS low power dissipation.

The ST1G3234B is intended for one-way
asynchronous communication between data
buses. The input and output power-down
protections disable the device when both power
supply are down, so that the buses are effectively
isolated.

The input tolerant buffers allow to translate V
compatible signals and greater signals than V
up/down to V
protection circuits against static discharge, giving
them ESD immunity and transient excess voltage.

The ST1G3234B is V
very low current consumption when the V
grounded.

2

MOS technology. Designed for use as an

CCB

CCA

CCB

is

. All inputs are equipped with

CCA

= 0 V tolerant, achieving

CCA

Order code Package Comments

ST1G3234BBJR Flip-Chip 5 4000 parts per reel

December 2007 Rev 2 1/17

www.st.com

17

Contents ST1G3234B

Contents

1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2/17

ST1G3234B Pin settings

1 Pin settings

1.1 Pin connection

Figure 1. Pin connection (top through view)

1.2 Pin description

Table 2. Pin description

Pin number Symbol Name and function

A1 A1 Data output (V

C1 B1 Data input (V

B2 GND Ground (0V)

A3 V

C3 V

CCA

CCB

referred)

CCA

referred)

CCB

Positive supply voltage

Positive supply voltage

3/17

Device summary ST1G3234B

2 Device summary

Figure 2. Input equivalent circuit

V

CCA

Overvolt.

control

A1B1

= (26Ω)

R

S

ESD

protection

GND GND GND

CS21760A

Figure 3. Logic diagram

Table 3. Truth table

Inputs B1 (V

LL

HH

CCB

ST1G3234B

V

CCA

A1

V

B1

referred) Outputs A1 (V

CCB

CS21000A

CCA

referred)

4/17

ST1G3234B 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. Refer also to the STMicroelectronics SURE
Program and other relevant quality documents.

Table 4. Absolute maximum ratings

Symbol Parameter Value Unit

V

V

V

V

I

I

T

CCA

CCB

OA

V

IB

OA

V

IB

I

IK

I

OK

I

OA

CCA

CCB

P

stg

T

Output supply voltage -0.5 to +4.6 V

Input supply voltage -0.5 to + 4.6 V

DC output voltage
(power down mode: V

CCA=VCCB

=Gnd)

DC input voltage
(power down mode: V

CCA=VCCB

=Gnd)

DC output voltage -0.5 to V

-0.5 to +4.6 V

-0.5 to +4.6 V

+ 0.5 V

CCA

DC input voltage -0.5 to + 4.6 V

DC input diode current − 20 mA

DC output diode current − 50 mA

DC output current ± 50 mA

DC V

DC V

Power dissipation 200 mW

d

or ground current ± 100 mA

CCA

or ground current ± 100 mA

CCB

Storage temperature -65 to +150 °C

Lead temperature (10 sec) 260 °C

L

5/17

Maximum rating ST1G3234B

3.1 Recommended operating conditions

Table 5. Recommended operating conditions

Symbol Parameter Value Unit

V

V

CCA

CCB

V

V

T

Supply voltage 1.4 to 3.6 V

Supply voltage 1.4 to 3.6 V

Input voltage (B1) 0 to V

IB

Output voltage (A1) 0 to V

OA

Operating temperature -40 to 85 °C

op

dt/dv Input rise and fall time

CCB

CCA

= 3.0 to 3.6 V 0 to 10 ns/V

V

CCB

= 2.3 to 2.7 V 0 to 20 ns/V

V

CCB

V

= 1.2 to

CCB

1.95 V

0 to 100 ns/V

V

V

6/17