PI74ALVCH16952 Datasheet, PDF (1/5 Pages) Pericom Semiconductor Corporation – 16-Bit Registered Transceiver With 3-STATE Outputs

PI74ALVCH16952
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16-Bit Registered Transceiver
With 3-STATE Outputs
Product Features
• PI74ALVCH16952 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
• 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:
– 48-pin 240 mil wide plastic TSSOP (A)
– 48-pin 300 mil wide plastic SSOP (V)
Logic Block Diagram
Product Description
Pericom Semiconductor’s PI74ALVCH series of logic circuits are
produced using the Company’s advanced 0.5 micron CMOS
technology, achieving industry leading speed.
The PI74ALVCH16952 16-bit registered transceiver is designed for
2.3V to 3.6V VCC operation.
The product contains two sets of D-type flip-flops for temporary
storage of data flowing in either direction. The device can be used
as two 8-bit transceivers or one 16-bit tranceiver. Data on the A or
B bus is stored in the registers on the low-to-high transition of the
clock (CLKAB or CLKBA) input provided that the clock-enable
(CLKENAB or CLKENBA) input is low. Taking the output-enable
(OEAB or OEBA) input low accesses the data on either port.
To ensure the high-impedance state during power up or power down,
OE should be tied to Vcc through a pull-up resistor; the minimum
value of the resistor is determined by the current-sinking capability
of the driver.
The PI74ALVCH16952 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.
3
1CLKENAB
2
1CLKAB
1OEBA ⁵⁶
54
1CLKENBA
55
1CLKBA
1
1OEAB
5
1A1
One of Eight
Channels
C1
CE
1D
C1
CE
1D
52
1B1
26
2CLKENAB
27
2CLKAB
2OEBA ²⁹
15
2A1
One of Eight
Channels
To Seven Other Channels
C1
CE
1D
C1
CE
1D
31
2CLKENBA
30
2CLKBA
28
2OEAB
42
2B1
To Seven Other Channels
1
PS8197A 10/16/00