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PDF HD74ALVCH16543 Data sheet ( Hoja de datos )
| Número de pieza | HD74ALVCH16543 | |
| Descripción | 16-bit Registered Transceivers with 3-state Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74ALVCH16543
16-bit Registered Transceivers with 3-state Outputs
ADE-205-169A (Z)
2nd. Edition
December 1999
Description
The HD74ALVCH16543 can be used as two 8-bit transceivers or one 16-bit transceiver. Separate latch
enable (LEAB or LEBA) and output enable (OEAB or OEBA) inputs are provided for each register to
permit independent control in either direction of data flow. The A to B enable (CEAB) input must be low
in order to enter data from A or to output data from B. If CEAB is low and LEAB is low, the A to B
latches are transparent; a subsequent low to high transition of LEAB puts the A latches in the storage mode.
With CEAB and OEAB both low, the 3-state B outputs are active and reflect the data present at the output
of the A latches. Data flow from B to A is similar but requires using CEBA, LEBA, and OEBA. 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
1OEBA
1CEBA
1LEBA
1OEAB
1CEAB
1LEAB
1A1
56
54
55
1
3
2
5
HD74ALVCH16543
C1
1D 52 1B1
C1
1D
2OEBA
2CEBA
2LEBA
2OEAB
2CEAB
2LEAB
2A1
29
31
30
28
26
27
15
To seven other channels
C1
1D 42 2B1
C1
1D
To seven other channels
5
5 Page 
HD74ALVCH16543
• 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 HD74ALVCH16543.PDF ] | |
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