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PI74AVC16834 Datasheet, PDF (1/9 Pages) Pericom Semiconductor Corporation – 18-Bit Universal Bus Driver with 3-State Outputs
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18-Bit Universal Bus Driver
with 3-State Outputs
Product Features
• Very high-speed, low-noise universal bus driver with
embedded resistor outputs
• Meets PC133 SDRAM Registered DIMM specification
• Implements output impedance control for low-noise and
heavy-load applications
• Fast Propagation Delay:
2.5ns max. for 50pF test load
• VCC = 3.3V or 2.5V or 1.8V
• Packages available:
– 56-pin 240 mil wide plastic TSSOP (A)
– 56-pin 173 mil wide plastic TVSOP (K)
Product Pin Configuration
NC
NC
Y1
GND
Y2
Y3
VCC
Y4
Y5
Y6
GND
Y7
Y8
Y9
Y10
Y11
Y12
GND
Y13
Y14
Y15
VCC
Y16
Y17
GND
Y18
OE
LE
1
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12
45
13 56-Pin 44
14 A56 43
K56
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
GND
NC
A1
GND
A2
A3
VCC
A4
A5
A6
GND
A7
A8
A9
A10
A11
A12
GND
A13
A14
A15
VCC
A16
A17
GND
A18
CLK
GND
Product Description
Pericom Semiconductor’s PI74AVC series of logic circuits
are produced using the Company’s 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 VCC 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.
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.
1
PS8378B 08/09/99
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