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PDF HD74ALVCH162721 Data sheet ( Hoja de datos )
| Número de pieza | HD74ALVCH162721 | |
| Descripción | 3.3-V 20-bit Flip Flops with 3-state Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74ALVCH162721
3.3-V 20-bit Flip Flops with 3-state Outputs
ADE-205-184B (Z)
3rd. Edition
December 1999
Description
The HD74ALVCH162721’s twenty flip flops are edge triggered D-type flip flops with qualified clock
storage. On the positive transition of the clock (CLK) input, the device provides true data at the Q outputs,
provided that the clock enable (CLKEN) input is low. If CLKEN is high, no data is stored. A buffered
output enable (OE) input can be used to place the twenty outputs in either a normal logic state (high or low
level) or a high impedance state. In the high impedance state, the outputs neither load nor drive the bus
lines significantly. The high impedance state and increased drive provide the capability to drive bus lines
without need for interface or pullup components. The output enable (OE) input does not affect the internal
operation of the flip flops. Old data can be retained or new data can be entered while the outputs are in the
high impedance state. Active bus hold circuitry is provided to hold unused or floating data inputs at a valid
logic level. All outputs, which are designed to sink up to 12 mA, include 26 Ω resistors to reduce
overshoot and undershoot.
Features
• VCC = 2.3 V to 3.6 V
• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
• Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)
• High output current ±12 mA (@VCC = 3.0 V)
• Bus hold on data inputs eliminates the need for external pullup / pulldown resistors
• All outputs have equivalent 26 Ω series resistors, so no external resistors are required.
1 page  
Logic Diagram
HD74ALVCH162721
OE 1
CLK 56
CLKEN 29
D1 55
CE
C1 2
1D Q1
To nineteen other channels
5
5 Page 
Package Dimensions
14.00
+0.3
–0.1
56
29
1
0.20
+0.1
–0.05
0.50
0.08 M
28
0.40 Max
0.10
HD74ALVCH162721
Unit : mm
8.10 ± 0.3
10° Max
0.50 ± 0.1
Hitachi code
EIAJ code
JEDEC code
TTP-56D
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11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HD74ALVCH162721.PDF ] | |
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