PI74AVC164245LA
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
16-Bit 1.5-2.5V to 3.3V Level Shifting
Transceiver with 3-State Outputs
Features
Description
• PI74AVC164245LA is designed for low voltage operation:
1.5V - 2.5V to 3.3V
Pericom Semiconductor’s PI74AVC164245LA, a 16-bit (dual-octal)
noninverting bus transceiver, contains two separate supply rails:
B port (VCCB), set at 3.3V, and A port (VCCA), set to operate
at 1.5-2.5V. This arrangement permits translation from a 1.5-2.5V to
3.3V environment and vice versa. The control pins, OE and DIR are
controlled by VCCB .
• Industrial operation at –40°C to +85°C
• Packag (Pb-free & Green available):
– 48-pin plastic 240-mil TSSOP (A)
– 48-pin plastic 173-mil TVSOP (K)
The PI74AVC164245LA is designed for asynchronous
communication between data buses.
Truth Table (each 8-bit section)
To ensure the high impedance state during power up or power
down, the output-enable (OE) input should be tied to VCC through
a pullup resistor: the minimum value of the resistor is determined by
the current-sinking capability of the driver.
Inputs
Ope ration
OE
DIR
L
L
H
L
H
X
B data to A bus
A data to B bus
Isolation
Block Diagram
Pin Configuration
(LVTTL)1DIR
1DIR
1
1
48
1OE(LVTTL)
1B1
2
47
1A1
1B2
41
1A5
9
40
1A6
10
39
GND
11
38
1A7
12
37
1A8
13
14
48-Pin 36
A, K 35
2A1
2B2
GND
15
34
GND
2B3
2OE
VCCA(1.5V-2.5V)
8
2B1
25
42
1B8
2DIR 24
1A4
7
GND
To Seven Other Channels
43
1B6
1B1
1A3
6
1B7
2
44
(3.3V)VCCB
47
GND
5
1B5
1A1
1A2
45
1B3
1OE
46
4
1B4
48
3
GND
16
33
2A3
2A2
08-0291
30
2A5
20
29
2A6
21
28
GND
2B7
22
27
2A7
2B8
1
VCCA(1.5V-2.5V)
19
GND
To Seven Other Channels
2A4
31
2B6
2B1
32
18
2B5
13
17
23
26
2A8
(LVTTL)2DIR
2A1
2B4
(3.3V)VCCB
36
24
25
2OE(LVTTL)
PS8600C
11/06/08
