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www.pericom.com P-0.1 07/18/12
PI74AVC164245
Block Diagram
Pin Configuration (28-Pin TQFN)
Description
Pericom Semiconductor’s PI74AVC164245, a 16-bit (dual-octal)
noninverting bus transceiver, contains two separate supply rails:
B port (V
CCB
), set at 3.3V, and A port (V
CCA
), set to operate
at 1.2-2.5V. This arrangement permits translation from a 1.2-2.5V
to 3.3V environment and vice versa.
The PI74AVC164245 is designed for asynchronous communication
between data buses.
To ensure the high impedance state during power up or power
down, the output-enable (OE) input should be tied to V
CCB
through
a pullup resistor: the minimum value of the resistor is determined
by the current-sinking capability of the driver.
Features
PI74AVC164245 is designed for low voltage operation:
1.2V - 2.5V to 3.3V
Industrial operation at –40°C to +85°C
Packaging (Pb-free & Green):
– 48-pin plastic 300-mil SSOP (V)
– 48-pin plastic 240-mil TSSOP (A)
– 48-pin plastic 173-mil TVSOP (K)
16-Bit 1.2-2.5V to 3.3V Level Shifting
Transceiver with 3-State Outputs
1DIR
1OE
1B1
1
47
1A1
To Seven Other Channels
2DIR
2OE
2B1
24
25
13
2
48
36
2A1
To Seven Other Channels
1
2
3
4
5
6
7
8
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
32
31
30
29
28
27
26
25
(3.3V LVTTL) 1DIR 1OE (3.3V LVTTL)
1B1
1B2
GND
1B3
1B4
(3.3V) V
CCB
1B5
1B6
GND
1B7
1B8
2B1
2B2
2B3
2B4
(3.3V) V
CCB
2B5
2B6
GND
2B7
2B8
(3.3V LVTTL) 2DIR
GND
1A1
1A2
GND
1A3
1A4
V
CCA
(1.2V-2.5V)
1A5
1A6
GND
1A7
1A8
2A1
2A2
2A3
2A4
V
CCA
(1.2V-2.5V)
2A5
2A6
GND
2A7
2A8
2OE (3.3V LVTTL)
GND
Truth Table (each 8-bit section)
Inputs
Operation
OE DIR
L L
L H
H X
B data to A bus
A data to B bus
Isolation
12-0208
