
1
PS8729F
10/11/08
Features
Operation Voltage: 1.65V ≤ VDDA ≤ 3.6V
2.3V ≤ VDDB ≤ 5.5V
VDDA ≤ VDDB
High Speed: tpd = 5ns typical into 30pF @ 3V VDD
Power down high-impedance inputs and outputs
High output drive: ±12mA at 3V VDDA/VDDB
±24mA at 5V VDDB
Industrial operation at –40°C to +85°C
Packaging (Pb-free & Green available):
– 8-pin MSOP (U)
– 12-pin TDFN (ZE)
PI74STX2G4245
Description
Pericom Semiconductor’s PI74STX2G4245, a 2-bit noninverting
buffer/transceiver, contains two separate supply rails:A port
(VDDA), set to operate from 1.8V to 3.3V; B port (VDDB), set
to operate from 2.5V to 5V. The A1 to B1 translation is con-
gured as an unidirectional buffer; the translation between
A2 and B2 is bidirectional and its direction is controlled
by the DIR pin. The DIR pin is supplied by VDDB.
Block Diagram
Pin Conguration (MSOP)
2-Bit Level Shifting Buffer/Transceiver
with Congurable Dual Supply Voltage
DIR
B2
4
3
A2
B1
7
6
2
A1
Function Table
Input
Output
DIR
DATA
LB2
A2
HA2
B2
XA1
B1
Pin Description
Pin Name
Description
DIR
Direction Control
A1
Data Input
B1
Data Output
A2, B2
Data Input/Output
VDDA, VDDB
Power Supply
V
DDB (2.5V to 5V)
1
(1.8V to 3.3V)
V
DDA
8
B1
2
A1
7
B2
3
A2
6
GND
4
DIR
5
Pin Conguration (TDFN)
1
2
3
4
5
6
12
11
10
9
8
7
NC
VDDB (2.5V to 5V)
B1
B2
GND
NC
(1.8V to 3.3V ) VDDA
A1
A2
DIR
NC
* NC = No Connect
08-0291