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PI74AVC16834

18-Bit Universal Bus Driver with 3-State Outputs

Pericom Semiconductor Corporation 

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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

• Packaging (Pb-free & Green available):

– 56-pin 240 mil wide plastic TSSOP (A)

Product Pin Configuration

NC 1

NC 2

Y1 3

GND 4

Y2 5

Y3 6

VCC 7

Y4 8

Y5 9

Y6 10

GND 11

Y7 12

Y8 13

Y9 14

Y10 15

Y11 16

Y12 17

GND 18

Y13 19

Y14 20

Y15 21

VCC 22

Y16 23

Y17 24

GND 25

Y18 26

OE 27

LE 28

56 GND

55 NC

54 A1

53 GND

52 A2

51 A3

50 VCC

49 A4

48 A5

47 A6

46 GND

45 A7

44 A8

43 A9

42 A10

41 A11

40 A12

39 GND

38 A13

37 A14

36 A15

35 VCC

34 A16

33 A17

32 GND

31 A18

30 CLK

29 GND

Product Description

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.

09-0003

1

PS8375H 10/27/09

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