PI74AVC16835K 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
1
56
GND
NC
2
55 ^NC
Y1
3
54 ^A1
GND
4
53
GND
Y2
5
52 ^A2
Y3
6
51 ^A3
VCC
7
50
VCC
Y4
8
49 ^A4
Y5
9
48 ^A5
Y6 10
47 A6
GND 11
46
GND
Y7 12
45 A7
Y8 13 ^56-Pin 44 A8
Y9
14 ^A56 43
A9
Y10
15 ^K56 42
A10
Y11 16
41
A11
Y12 17
40
A12
GND 18
39
GND
Y13 19
38
A13
Y14 20
37
A14
Y15 21
36
A15
VCC
22
Y16 23
35
VCC
34
A16
Y17 24
33
A17
GND 25
32
GND
Y18 26
31
A18
OE 27
30
CLK
LE 28
29
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 PI74AVC16835 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 HIGH. The A
data is latched if CLK is held at a high or low logic level. If LE is
LOW, 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 PI74AVC16835 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.
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PS8373D 08/03/99