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HD74ALVCH162831 数据表(PDF) 1 Page - Hitachi Semiconductor

部件名 HD74ALVCH162831
功能描述  1-bit 4-bit Address Register / Driver with 3-state Outputs
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制造商  HITACHI [Hitachi Semiconductor]
网页  http://www.renesas.com/eng
标志 HITACHI - Hitachi Semiconductor

HD74ALVCH162831 数据表(HTML) 1 Page - Hitachi Semiconductor

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HD74ALVCH162831
1-bit 4-bit Address Register / Driver with 3-state Outputs
ADE-205-195 (Z)
Preliminary
1st. Edition
March 1998
Description
This 1-bit to 4-bit address register / driver is designed for 2.3 V to 3.6 V V
CC operation. The device is ideal
for use in applications in which a single address bus is driving four separate memory locations. The
HD74ALVCH162831 can be used as a buffer or a register, depending on the logic level of the select (
SEL)
input. When
SEL is logic high, the device is in the buffer mode. The outputs follow the inputs and are
controlled by the two output enable (
OE) controls. Each OE controls two groups of nine outputs. When
SEL is logic low, the device is in the register mode. The register is an edge triggered D-type flip flop. On
the positive transition of the clock (CLK) input, data set up at the A inputs is stored in the internal registers.
OE controls operate the same as in buffer mode. When OE is logic low, the outputs are in a normal logic
state (high or low logic level). When
OE is logic 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 V
CC through a
pullup registor; the minimum value of the registor is determined by the current sinking capability of the
driver.
SEL and OE do not affect the internal operation 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. All outputs, which are designed to sink up to
12 mA, include 26
Ω resistors to reduce overshoot and undershoot.
Features
• V
CC = 2.3 V to 3.6 V
• Typical V
OL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
• Typical V
OH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)
• High output current ±12 mA (@V
CC = 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.


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