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PI74AVC16834 Datasheet

  • PI74AVC16834

  • 18-Bit Universal Bus Driver with 3-State Outputs

  • 9頁

  • PERICOM   PERICOM

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PI74AVC16834
18-Bit Universal Bus Driver
with 3-State Outputs
Product Features
聲 Very high-speed, low-noise universal bus driver with
embedded resistor outputs
聲 Meets PC133 SDRAM Registered DIMM specification
聲 Implements output impedance control for low-noise and
heavy-load applications
聲 Fast Propagation Delay:
2.5ns max. for 50pF test load
聲 V
CC
= 3.3V or 2.5V or 1.8V
聲 Packages available:
聳 56-pin 240 mil wide plastic TSSOP (A)
聳 56-pin 173 mil wide plastic TVSOP (K)
Product Description
Pericom Semiconductor鈥檚 PI74AVC series of logic circuits
are produced using the Company鈥檚 advanced 0.35 micron CMOS
technology, achieving industry leading speed.
The 18-bit PI74AVC16834 universal bus driver is designed for
1.8V to 3.6V V
CC
operation.
Data flow from A to Y is controlled by Output Enable (OE). The
device operates in the transparent mode when LE is LOW. The A
data is latched if CLK is held at a high or low logic level. If LE is
HIGH, the A-bus is stored in the latch/flip-flop on the low-to-high
transition of CLK. When OE is HIGH, the outputs are in the high-
impedance state.
The PI74AVC16834 bus driver is designed to drive an array of
133 MHz synchronous memory chips, with minimal undershoot/
overshoot noise, and to meet the input signal rise/fall time
requirement of memory chips.
GND
NC
A1
GND
A2
A3
V
CC
A4
A5
A6
GND
A7
A8
A9
A10
A11
A12
GND
A13
A14
A15
V
CC
A16
A17
GND
A18
CLK
GND
Product Pin Configuration
NC
NC
Y1
GND
Y2
Y3
V
CC
Y4
Y5
Y6
GND
Y7
Y8
Y9
Y10
Y11
Y12
GND
Y13
Y14
Y15
V
CC
Y16
Y17
GND
Y18
OE
LE
1
2
3
4
5
6
7
8
9
10
56
55
54
53
52
51
50
49
48
47
The output drivers of this part have an embedded series-resistor.
For DIMM module design, no external series termination resistors
near the buffer drivers or any other termination resistors are
required. This feature simplifies DIMM module layout design, and
results in cost savings.
46
11
45
12
13
56-Pin
44
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
A56
K56
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
1
PS8378B
08/09/99

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