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
ST1G3234B Electrical characteristics
4 Electrical characteristics
Table 6. DC specification
Test condition Value
Symbol Parameter
IHB
ILB
OHA
OLA
I
IB
High level
input voltage
Low level input
voltage
High level
output voltage
Low level
output voltage
Input leakage
current
V
V
V
V
CCB
(1)
V
(V)
CCA
(1)
V
(V)
1.4
1.8 0.65 V
1.4 to
2.5 1.6 1.6
3.6
TA = 25 °C -40 to 85 °C
Min Max Min Max
0.65 V
CCB
CCB
0.65 V
0.65 V
CCB
CCB
3.3 2.0 2.0
1.4
1.4 to
1.8 0.35 V
0.35 V
3.6
CCB
CCB
0.35 V
0.35 V
2.5 0.7 0.7
3.3 0.8 0.8
1.4 to
3.6
1.4 to
3.6
2.7 3.6
1.4 2.7
1.4 I
2.75 I
2.3 I
1.65 I
1.4 I
1.4 I
2.75 I
2.75 I
2.3 I
1.65 I
1.4 I
= -100 μA1.2 1.2
O
=-10mA 2.2 2.2
O
=-6mA 1.8 1.8
O
=-2mA 1.4 1.4
O
=-1mA 1.1 1.1
O
= -100 μA0.20 0.20
O
= 1 mA 0.40 0.40
O
=10mA 0.55 0.55
O
= 6 mA 0.40 0.40
O
= 2 mA 0.25 0.25
O
= 1 mA 0.20 0.20
O
=3.6V
± 0.5 ± 5 μA
± 0.5 ± 5 μA
V
IB=VCCB
or GND
V
IB
or GND
Unit
V
CC
B
CC
B
V
V
V
I
OFF
Power OFF
leakage
current
V
00
= GND to
IB
3.6 V
VOA= GND
to 3.6 V
± 1.0 ± 10 μA
7/17
Electrical characteristics ST1G3234B
Table 6. DC specification (continued)
Test condition Value
Symbol Parameter
V
(V)
1.4 to
CCB
CCA
Quiescent
supply current
Quiescent
supply current
1.4 to
1.4 to
I
I
1. VCC range = 1.8 ± 0.15 V; 2.5 ± 0.2 V; 3.3 ± 0.3 V
CCB
3.6
3.6
3.6
(1)
V
CCA
(1)
(V)
1.4 to
3.6
0
1.4 to
3.6
VIB=V
VIB =V
Table 7. AC electrical characteristics
Symbol Parameter
t
PLH tPHL
Propagation delay time B1 to A1
TA = 25 °C -40 to 85 °C
Min Max Min Max
CCB
or GND
CCB
GND
or
0.5 5 μA
0.5 5 μA
Test condition Value
V
CCB
(V)
V
CCA
(V)
2.3 to 3.6 1.4
-40 to 85 °C
Min Max
2.0 5.0
1.4 to 1.95 1.4 2.0 5.0
2.3 to 3.6 1.65 to 1.95 2.0 4.5
1.4 to 1.95 1.65 to 1.95 2.0 4.8
CL=10pF
1.4 to 1.95 2.3 to 2.7 2.0 3.5
1.4 to 1.95 3.0 to 3.6 2.0 3.5
2.3 to 2.7 3.0 to 3.6 1.0 3.0
Unit
Unit
ns
2.3 to 3.6 1.4
1.4 to 1.95 1.4 2.0 5.5
2.3 to 3.6 1.65 to 1.95 2.0 5.0
t
PLH tPHL
Propagation delay time B1 to A1
1.4 to 1.95 1.65 to 1.95 2.0 5.2
1.4 to 1.95 2.3 to 2.7 2.0 4.0
1.4 to 1.95 3.0 to 3.6 2.0 4.0
2.3 to 2.7 3.0 to 3.6 1.0 3.5
8/17
C
=30pF
L
RL= 500 Ω
2.0 5.5
ns
ST1G3234B Electrical characteristics
Table 8. Capacitance characteristics
Test condition Value
Symbol Parameter
C
C
Input capacitance open open 5 pF
INB
Output capacitance 2.5 3.3 6 pF
O
V
V
CCB
(V)
2.5 3.3
CCA
(V)
TA = 25 °C -40 to 85 °C
Min Typ Max Min Max
27
1.8 3.3 27
C
Power dissipation
PD
capacitance
1.4 2.5 23
f=10MHz
1.4 1.8 20
3.3 1.8 27
Note: 1 CPD is defined as the value of the device’s internal equivalent capacitance which is
calculated from the operating current consumption without load. (Refer to Test Circuit).
Average current can be obtained by the following equation: I
= CPD x VCC x fIN + ICC/4
CC(opr)
(per circuit)
Unit
pF
9/17
Test circuit ST1G3234B
5 Test circuit
Figure 4. Test circuit
V
CCBVCCA
6V or 2V
CC
Pulse
generator
D.U. T
R
1
OPEN
GND
R
T
C
L
Table 9. Test circuit
Tes t Sw itch
t
, t
PLH
PHL
C
= 10/30 pF or equivalent (includes jig and probe capacitance)
L
R
= R1 = 500Ω or equivalent
L
R
= Z
T
of pulse generator (typically 50Ω)
OUT
R
L
CS14810A
Open
10/17
ST1G3234B Waveforms
6 Waveforms
Table 10. Waveform symbol value
V
Symbol
3.0 to 3.6 V 2.3 to 2.7 V 1.65 to 1.95 V
CC
V
IH
V
M
V
CC
1.5 V VCC/2 VCC/2
V
CC
Figure 5. Waveform - propagation delay (f = 1 MHz; 50 % duty cycle)
B1
A1
B1
A1
2.0ns
10%
90%
V
M
t
PHL
90%
V
M
10%
V
2.0ns
M
V
IH
OV
t
PHL
V
OH
V
M
V
OL
V
CC
CS21770A
11/17
Package mechanical data ST1G3234B
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect . The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
Figure 6. Marking
Distinguishing feature
8V Y WW
marking
assy
value
year
assy
week
A
B
C
12
8VYWW
3
Marking
CS2011
12/17
ST1G3234B Package mechanical data
Figure 7. Flip-Chip 5 package outline
13/17
Package mechanical data ST1G3234B
Table 11. Flip-Chip 5 mechanical data
millimeters mils
Symbol
Min Typ Max Min Typ Max
A 0.585 0.65 0.714 23.0 25.6 28.1
A1 0.21 0.25 0.29 8.3 9.8 11.4
a2 0.40 15.7
b 0.265 0.315 0.365 10.4 12.4 14.4
D 1.311.361.4151.653.555.5
D1 9.866 34.1
E 0.971.021.0738.240.242.1
E1 0.5 19.7
eD 0.383 0.433 0.483 15.1 17.0 19.0
eE 0.20 0.25 0.30 7.9 9.8 11.8
fD 0.247 9.7
fE 0.260 10.2
ccc 0.080 3.1
14/17
ST1G3234B Package mechanical data
Figure 8. Flip-Chip 5 tape and reel information
1. Drawing not to scale.
Table 12. Flip-Chip 5 tape and reel mechanical data
millimeters inches
Symbol
Min Typ Max Min Typ Max
A 178 6.926
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 4950511.9291.9692.008
T12.40.488
Ao 1.60 1.65 1.70 0.063 0.065 0.067
Bo 1.27 1.32 1.37 0.050 0.052 0.054
Ko 0.76 0.81 0.86 0.030 0.032 0.034
Po 3.9 4 4.1 0.153 0.157 0.161
P 3.9 4 4.1 0.153 0.157 0.161
15/17
Revision history ST1G3234B
8 Revision history
Table 13. Document revision history
Date Revision Changes
1-Aug-2007 1 Initial release.
3-Dec-2007 2
Changed t
Recommended operating conditions on page 6, updated V
at V
CCA
value from 4.4 ns to 4.0 ns, removed footnote inTa b le 5 :
PD
OLA
= 1.4 V, changed symbol names for quiescient supply
value
current and minor text changes in Table 6: DC specification on
page 7, removed V
and VY waveforms data in Table 10: Waveform
x
symbol value on page 11, replaced Figure 6: Marking on page 12
and enlarged Figure 7: Flip-Chip 5 package outline on page 13 to
improve readability.
16/17
ST1G3234B
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