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HD74ALVCH16835

Hitachi Semiconductor
Part Number HD74ALVCH16835
Manufacturer Hitachi Semiconductor
Description 18-bit Universal Bus Driver with 3-state Outputs
Published Mar 23, 2005
Detailed Description HD74ALVCH16835 18-bit Universal Bus Driver with 3-state Outputs ADE-205-126D (Z) 5th. Edition December 1999 Description...
Datasheet PDF File HD74ALVCH16835 PDF File

HD74ALVCH16835
HD74ALVCH16835

Overview
HD74ALVCH16835 18-bit Universal Bus Driver with 3-state Outputs ADE-205-126D (Z) 5th.
Edition December 1999 Description The HD74ALVCH16835 is an 18-bit universal bus driver designed for 2.
3 V to 3.
6 V V CC 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) input is high.
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 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.
To ensure the high impedance state during power up or power down, the output ebable ( OE) input should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current sinking capability of the driver.
Active bus hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
Features • Supports unregulated battery operation down to 2.
7 V • Bus hold on data inputs eliminates the need for external pullup resistors.
• Distrlbuted VCC and GND pin conflguration minimizes high speed switching noise.
HD74ALVCH16835 Function Table Inputs OE H L L L L L L H: L: X: Z: ↑: Notes: LE X H H L L L L CLK X X X ↑ ↑ H L A X L H L H X X Output Y Z L H L H Y0 *1 Y0 *2 High level Low level Immaterial High impedance Low to high transition 1.
Output level before the indicated steady-state input conditions were established, provided that CLK was high before LE went low.
2.
Output level before the indicated steady-state input conditions were established.
2 HD74ALVCH16835 Pin Arrangement NC 1 NC 2 Y1 3 GND 4 Y2 5 Y3 6 VCC 7 Y4 8 Y5 9 Y6 10 GND 11 Y7 12 Y8 13 Y9 14 Y10 15 Y11 16 Y12 17 GND 18 Y13 19 Y14 20 Y15 21 VCC 22 Y16 23 Y17 24 GND 25 Y18 26 OE 27 LE 28 (Top view) 56 GND 55 NC 54 A1 53 GND 52 A2 51 A3 50 VCC 49 A4 48 A5 47 A6 46 GND 45 A7 44 A8 43 A9 42 A10 41 A11 40 A12 39 GND 38 A13 37 A14 36 A15 35 VCC 3...


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