ST ST1G3234 User Manual
Features
ST1G3234
1-bit dual supply bus buffer level translator
with A-side series resistor
■ High speed: t
V
= 1.65V; V
CCB
■ Low power dissipation:
I
= I
CCA
■ Symmetrical output impedance:
|I
V
|I
V
■ Balanced propagation delays:
t
PLH
■
Power down protection on inputs and outputs
■ 26Ω series resistor on A-side outputs
| = I
OHA
= 2.75V; V
CCA
| = I
OHA
= 2.3V; V
CCA
≅ t
CCB
OLA
OLA
PHL
= 4.4ns (Max.) at TA = 85°C
PD
CCA
= 3.0V
= 5µA(Max.) at TA = 85°C
= 10mA Min at
= 1.4V to 3.6V
CCB
= 6mA Min at
= 1.4V to 3.6V
CCB
– Operating voltage range:
V
(Opr) = 1.4V to 3.6V (1.2V data
CCA
retent)
V
(Opr) = 1.4V to 3.6V (1.2V data
CCB
retent)
■ Max data rates:
380Mbps (1.8V to 3.3V translation)
260Mbps (<1.8V to 3.3V translation)
260Mbps (translate to 2.5V)
210Mbps (translate to 1.5V)
■ Latch-up performance exceeds 500mA
(JESD 17)
■ ESD performance:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
■ R
HS compliant for Flip-Chip package
O
Flip-Chip 5
Description
The ST1G3234 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 3.3V bus and a 2.5V or 1.8V
bus in a mixed 3.3V/1.8V, 3.3V/2.5V, 1.8V/1.4V
and 2.5V/1.8V supply systems, it achieves high
speed operation while maintaining the CMOS low
power dissipation.
This IC 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
All inputs are equipped with protection circuits
against static discharge, giving them ESD
immunity and transient excess voltage.
2
MOS technology. Designed for use as an
CCB
CCB
CCA
.
Order codes
Part number Package Comments
ST1G3234BJR Flip-Chip 5 4000 parts per reel
August 2006 Rev 6 1/15
www.st.com
15
Contents ST1G3234
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
ST1G3234 Pin settings
1 Pin settings
1.1 Pin connection
Figure 1. Pin connection (top through view)
1.2 Pin description
Table 1. Pin description
Pin N° 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
3/15
Device summary ST1G3234
2 Device summary
Figure 2. Input equivalent circuit
Figure 3. Logic diagram
Table 2. Truth table
Inputs B1 (V
4/15
Referred) Outputs A1 (V
CCB
LL
HH
Referred)
CCA
ST1G3234 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 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
V
V
I
I
T
V
V
I
I
CCA
CCB
Output supply voltage -0.5 to +4.6 V
CCA
Input supply voltage -0.5 to + 4.6 V
CCB
DC output voltage
OA
(power down mode: V
DC input voltage
IB
(power down mode: V
DC output voltage
OA
DC input voltage -0.5 to + 4.6 V
IB
I
DC input diode current − 20 mA
IK
DC output diode current − 50 mA
OK
DC output current ± 50 mA
OA
DC V
DC V
P
Power dissipation 200 mW
d
Storage temperature -65 to +150 °C
stg
T
Lead temperature (10 sec) 260 °C
L
or ground current
CCA
or ground current
CCB
CCA=VCCB
CCA=VCCB
=Gnd)
=Gnd)
-0.5 to +4.6 V
-0.5 to +4.6 V
-0.5 to V
CCA
± 100 mA
± 100 mA
+ 0.5
V
5/15
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