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PDF HD74ALVCH16821 Data sheet ( Hoja de datos )
| Número de pieza | HD74ALVCH16821 | |
| Descripción | 3.3-V 20-bit Bus Interface Flip Flops with 3-state Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74ALVCH16821
3.3-V 20-bit Bus Interface Flip Flops with 3-state Outputs
ADE-205-171B (Z)
3rd. Edition
December 1999
Description
The HD74ALVCH16821 can be used as two 10-bit flip flops or one 20-bit flip flop. The 20 flip flops are
edge triggered D-type flip flops. On the positive transition of the clock (CLK) input, the device provides
true data at the Q outputs. A buffered output enable (OE) input can be used to place the ten outputs in
either a normal logic state (high or low levels) 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 line without need for interface or pullup components. The output enable
(OE) input does not affect the internal operations 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.
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 ±24 mA (@VCC = 3.0 V)
• Bus hold on data inputs eliminates the need for external pullup / pulldown resistors
1 page  
Logic Diagram
1OE 1
1CLK 56
1D1 55
1 of 10
Channels
C1
1D
HD74ALVCH16821
2 1Q1
2OE 28
2CLK 29
2D1 42
To nine other channels
1 of 10
Channels
C1
1D
15 2Q1
To nine 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
HD74ALVCH16821
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 HD74ALVCH16821.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HD74ALVCH16820 | 3.3-V 10-bit Flip Flops with Dual Outputs | Hitachi Semiconductor |
| HD74ALVCH16821 | 3.3-V 20-bit Bus Interface Flip Flops with 3-state Outputs | Hitachi Semiconductor |
| HD74ALVCH16825 | 18-bit Buffers / Drivers with 3-state Outputs | Hitachi Semiconductor |
| HD74ALVCH16827 | 20-bit Buffers / Drivers with 3-state Outputs | Hitachi Semiconductor |
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