74HC244D,653

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74HC244D,653

IC BUFF/DVR TRI-ST DUAL 20SOIC

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Spezifikationen

Supplier Rochester Electronics, LLC
Package Bulk
Series 74HC
ProductStatus Active
LogicType Buffer, Non-Inverting
NumberofElements 2
NumberofBitsperElement 4
OutputType 3-State
Current-OutputHighLow 7.8mA, 7.8mA
Voltage-Supply 2V ~ 6V
OperatingTemperature -40°C ~ 125°C (TA)
MountingType Surface Mount
Package/Case 20-SOIC (0.295, 7.50mm Width)

Übersicht

Description

Here’s a quick intro to those two 74HC parts (in CMOS HC family):
- 74HC244D
- Octal buffer/line driver with 3-state outputs.
- Two groups of four non‑inverting buffers. Data flows A0–A7 to Y0–Y7 when enabled.
- Two active-low enables (G1 and G2); outputs go high-Z when disabled.
- Used to buffer a data/bus, increase fan-out, isolate devices on a shared bus.
- Typical Vcc = 2–6 V; standard HC timing, low power.
- 74HC653
- An 8-bit register/latch with 3-state outputs (bus-capable).
- Inputs (D0–D7) are latched to outputs (Q0–Q7) when a latch/clock signal is active; outputs can be tri-stated via OE.
- Used to capture and hold bus/data values or to demultiplex/address-data lines on a bus.
- Commonly packaged similarly to other HC devices; check exact pinout in datasheet.
Note: Verify the exact pinout and control names in the specific datasheet for your package and manufacturer.

Pinout

- Pin count: 20 pins (DIP-20 / SO-20).
- Function: 74HC244D is an octal buffer/line driver with tri-state outputs. It contains two 4-bit buffers (A0–A3 to Y0–Y3 and A4–A7 to Y4–Y7) with separate active-low enable inputs (G1 and G2). When an enable is low, the corresponding four outputs follow the inputs; when high, those outputs are high-impedance.

Manufacturer

Manufacturer: Texas Instruments (TI).
TI is an American multinational corporation that designs and manufactures semiconductors and integrated circuits; one of the world’s largest semiconductor companies, founded in 1930 (as Geophysical Service, Inc.) and reorganized as Texas Instruments in 1951.

Application

- 74HC244D: Octal buffer/line driver with two 4-bit sections and tri-state outputs. Applications: buffer/drive data and address buses between CPU and memory/IO, isolate loads, reduce back-driving, and control bus segments in microprocessor systems.
- 74HC653: 8-bit latch/tri-state register (two 4-bit sections). Applications: latch and demultiplex multiplexed address/data lines on CPUs with multiplexed buses; hold stable address during memory cycles; general 8-bit bus-interface storage.

Equivalent

Equivalent parts to 74HC244D are other 74xx244 line drivers: TI SN74HC244 (same family), SN74HCT244 (TTL input thresholds); 74LS244, 74ACT244, 74AHC244, 74AVC244 from various vendors (NXP/Nexperia, Onsemi, Renesas). In practice any 8-bit octal buffer/3-state in the 74xx244 family is functionally equivalent, with thresholds/speed differing (HCT TTL-input; LS/ACT/AVC for voltage/speed ranges).

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