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PDF HD74ALVC162835 Data sheet ( Hoja de datos )
| Número de pieza | HD74ALVC162835 | |
| Descripción | 18-bit Universal Bus Driver with 3-state Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74ALVC162835
18-bit Universal Bus Driver with 3-state Outputs
ADE-205-201E (Z)
Preliminary
6th. Edition
January 1999
Description
The HD74ALVC162835 is an 18-bit universal bus driver designed for 2.3 V to 3.6 V VCC operation.
Data flow from A to Y is controlled by the output enable (OE). The device operates in the transparent mode
when the latch enable (LE) is high. When LE is low, the A data is latched if the clock (CLK) input is held
at a high or low logic level. If the LE is low, the A 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.
To ensure the high impedance state during power up or power down, OE should be tied to VCC through a
pullup registor; the minimum value of the registor is determined by the current sinking capability of the
driver.
All outputs, which are designed to sink up to 12 mA, include 26 Ω resistors to reduce overshoot and
undershoot.
Features
• Meets “PC SDRAM registered DIMM design support document, Rev. 1.2”
• 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)
• 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
HD74ALVC162835
1D
C1
CLK
3 Y1
To seventeen other channels
5
5 Page 
HD74ALVC162835
Waveforms – 3
Output
Control
tf
90 %
Vref
10 %
tZL
Waveform - A
Vref
tZH
Waveform - B
Vref
tr
10 %
90 %
Vref
tLZ
Vref1
tHZ
Vref2
VIH
GND
≈VOH1
VOL
VOH
≈VOL1
Notes:
TEST
VIH
Vref
Vref1
Vref2
VOH1
VOL1
Vcc=2.5±0.2V
VCC
Vcc=2.7V,
3.3±0.3V
2.7 V
1/2 VCC
1.5 V
VOL +0.15 V VOL +0.3 V
VOH–0.15 V VOH–0.3 V
VCC 3.0 V
GND
GND
1. All input pulses are supplied by generators having the following characteristics :
PRR ≤ 10 MHz, Zo = 50 Ω, tr ≤ 2.0 ns, tf ≤ 2.0 ns. (VCC = 2.5±0.2 V)
PRR ≤ 10 MHz, Zo = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns. (VCC = 2.7 V, 3.3±0.3 V)
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 15 Páginas | |
| PDF Descargar | [ Datasheet HD74ALVC162835.PDF ] | |
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