ST1G3234B Datasheet PDF - STMicroelectronics


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ST1G3234B
STMicroelectronics

Part Number ST1G3234B
Description 1-bit dual supply bus buffer level translator
Page 17 Pages

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ST1G3234B
1-bit dual supply bus buffer level translator
with A-side series resistor
Features
High speed: tPD = 4.0 ns (max.) at TA = 85 °C
VCCB = 1.65 V; VCCA = 3.0 V
Low power dissipation:
ICCA = ICCB = 5 μA (max.) at TA = 85 °C
Symmetrical output impedance:
|IOHA| = IOLA = 10 mA min at
VCCA = 2.75 V; VCCB = 1.4 to 3.6 V
|IOHA| = IOLA = 6 mA min. at
VCCA = 2.3 V; VCCB = 1.4 to 3.6 V
Balanced propagation delays:
tPLH tPHL
Power-down protection on inputs and outputs
26 Ω series resistor on A-side outputs
Operating voltage range:
– VCCA (opr.) = 1.4 to 3.6 V
– VCCB (opr.) = 1.4 to 3.6 V
Allows partial power-down when VCCA = 0,
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
ROHS compliant to Flip-Chip package
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 C2MOS 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,
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 VCCB
compatible signals and greater signals than VCCB
up/down to VCCA. All inputs are equipped with
protection circuits against static discharge, giving
them ESD immunity and transient excess voltage.
The ST1G3234B is VCCA = 0 V tolerant, achieving
very low current consumption when the VCCA is
grounded.
Table 1. Device summary
Order code
Package
Comments
ST1G3234BBJR
Flip-Chip 5
4000 parts per reel
December 2007
Rev 2
1/17
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Contents
Contents
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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
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ST1G3234B
1 Pin settings
1.1 Pin connection
Figure 1. Pin connection (top through view)
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1.2 Pin description
Table 2. Pin description
Pin number
A1
C1
B2
A3
C3
Symbol
A1
B1
GND
VCCA
VCCB
Name and function
Data output (VCCA referred)
Data input (VCCB referred)
Ground (0V)
Positive supply voltage
Positive supply voltage
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Device summary
2 Device summary
Figure 2. Input equivalent circuit
VCCA
B1
ESD
protection
GND
GND
GND
Overvolt.
control
RS = (26Ω)
Figure 3. Logic diagram
VCCB VCCA
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A1
CS21760A
B1 ST1G3234B
Table 3. Truth table
Inputs B1 (VCCB referred)
L
H
A1
CS21000A
Outputs A1 (VCCA referred)
L
H
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