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PDF HD74ALVCH162835 Data sheet ( Hoja de datos )
| Número de pieza | HD74ALVCH162835 | |
| Descripción | 18-bit Universal Bus Drivers with 3-state Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74ALVCH162835
18-bit Universal Bus Drivers with 3-state Outputs
ADE-205-189B (Z)
3rd. Edition
December 1999
Description
Data flow from A to Y is controlled by the 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 data 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. 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
OE
CLK
LE
A1
27
30
28
54
HD74ALVCH162835
1D
C1
CLK
3 Y1
To seventeen other channels
5
5 Page 
HD74ALVCH162835
• Waveforms – 3
tf
Output
Control
90 %
Vref
10 %
tZL
Waveform - A
Vref
tZH
Waveform - B
Vref
tr
10 %
90 %
Vref
tLZ
tHZ
VOL + 0.3 V
VOH – 0.3 V
VIH
GND
≈VOH1
VOL
VOH
≈VOL1
TEST
VIH
Vref
VOH1
VOL1
Vcc=2.5±0.2V
2.3 V
1.2 V
2.3 V
GND
Vcc=2.7V,
3.3±0.3V
2.7 V
1.5 V
3.0 V
GND
Notes: 1. All input pulses are supplied by generators having the following characteristics:
PRR ≤ 10 MHz, Zo = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
2. Waveform – A is for an output with internal conditions such that the output is low
except when disabled by the output control.
3. Waveform – B is for an output with internal conditions such that the output is high
except when disabled by the output control.
4. The output are measured one at a time with one transition per measurement.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HD74ALVCH162835.PDF ] | |
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