PI74ALVCH162827 Datasheet, PDF (1/4 Pages) Pericom Semiconductor Corporation – 20-Bit Buffer Driver with 3-STATE Outputs

PI74ALVCH162827
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20-Bit Buffer Driver
with 3-STATE Outputs
Product Features
• PI74ALVCH162827 is designed for low voltage operation
• V_CC = 2.3V to 3.6V
• Hysteresis on all inputs
• Typical V_OLP (Output Ground Bounce)
< 0.8V at V_CC = 3.3V, T_A = 25°C
• Typical V_OHV (Output V_OH Undershoot)
< 2.0V at V_CC = 3.3V, T_A = 25°C
• Output ports have equivalent 26Ω series resistors;
no external resistors are required
• Bus Hold retains last active bus state during 3-STATE,
eliminating the need for external pullup resistors
• Industrial operation at –40°C to +85°C
• Packages available:
– 56-pin 240 mil wide plastic TSSOP (A)
– 56-pin 300 mil wide plastic SSOP (V)
Product Description
Pericom Semiconductor’s PI74ALVCH series of logic circuits are
produced in the Company’s advanced 0.5 micron CMOS
technology, achieving industry leading speed.
The PI74ALVCH162827 is a 20-bit non-inverting buffer/driver
designed for 2.3V to 3.6V V_CC operation.
The buffer/driver is composed of two 10-bit sections with separate
output-enable signals. For either 10-bit buffer section, the two
output-enable (1OE1 and 1OE2 or 2OE1 and 2OE2) inputs must
both be low for the corresponding Y outputs to be active. If either
output-enable input is HIGH, the outputs of that 10-bit buffer
section are in the high-impedance state.
The outputs, which are designed to sink up to 12mA, include 26Ω
resistors to reduce overshoot and undershoot.
To ensure the high-impedance state during power up or power
down, OE should be tied to V_CC through a pullup resistor; the
minimum value of the resistor is determined by the current-sinking
capability of the driver.
The PI74ALVCH162827 has “Bus Hold” which retains the data
input’s last state whenever the data input goes to high-impedance
preventing “floating” inputs and eliminating the need for pullup/
down resistors.
Logic Block Diagram
1OE1 ¹
1OE2 ⁵⁶
1A1 ⁵⁵
2 _1Y1
To 9 Other Channels
2OE1 ²⁸
2OE2 ²⁹
2A1 ⁴²
15 _2Y1
To 9 Other Channels
1
PS8095B 10/07/98