參數(shù)資料
型號(hào)： HCT259
廠商： NXP Semiconductors N.V.
英文描述： Zener Diode; Zener Voltage Typ, Vz:2.7V; Vz Test Current, Izt:20mA; Power Dissipation, Pd:500mW; Package/Case:DO-35; Breakdown Voltage Max:2.7V; Forward Current:200A; Leakage Current Max:100uA; Mounting Type:Through Hole
中文描述： 8位可尋址鎖存器
文件頁(yè)數(shù)： 2/20頁(yè)
文件大小： 95K
代理商： HCT259
2000 Mar 14
2
Philips Semiconductors
Product specification
8-bit addressable latch
74AHC259;
74AHCT259
FEATURES
ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V
CDM EIA/JESD22-C101 exceeds 1000 V
Balanced propagation delays
All inputs have Schmitt-trigger actions
Combines demultiplexer and 8-bit latch
Serial-to-parallel capability
Output from each storage bit available
Random (addressable) data entry
Easily expandable
Common reset input
Useful as a 3-to-8 active HIGH decoder
Inputs accept voltages higher than V
CC
For AHC only: operates with CMOS input levels
For AHCT only: operates with TTL input levels
Specified from
40 to +85
°
C and from
40 to +125
°
C.
DESCRIPTION
The 74AHC/AHCT259 are high-speed Si-gate CMOS
devices and are pin compatible with Low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard No. 7A.
The 74AHC/AHCT259 are high-speed 8-bit addressable
latches designed for general purpose storage applications
in digital systems. The ‘259’ are multifunctional devices
capable of storing single-line data in eight addressable
latches, and also 3-to-8 decoder and demultiplexer, with
active HIGH outputs (Q0 to Q7), functions are available.
The ‘259’ also incorporates an active LOW common reset
(MR) for resetting all latches as well as an active LOW
enable input (LE).
The ‘259’ has four modes of operation as shown in the
mode select table. In the addressable latch mode, data on
the data line (D) is written into the addressed latch. The
addressed latch will follow the data input with all non-
addressed latches remaining in their previous states.
In the memory mode, all latches remain in their previous
states and are unaffected by the data or address inputs.
In the 3-to-8 decoding or demultiplexing mode, the
addressed output follows the state of the (D) input with all
other outputs in the LOW state. In the reset mode all
outputs are LOW and unaffected by the address
(A0 to A2) and data (D) input. When operating the ‘259’ as
an address latch, changing more than one bit of the
address could impose a transient-wrong address.
Therefore, this should only be done while in the memory
mode.
The mode select table summarizes the operations of
the ‘259’.
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