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HD74HC298 Datasheet

Part Number HD74HC298
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description Quad. 2-input Multiplexers (with storage)
Datasheet HD74HC298 DatasheetHD74HC298 Datasheet (PDF)

HD74HC298 Quad. 2-input Multiplexers (with storage) Description This circuit is controlled by the signals word select and clock. When the word select input is taken low word 1 (A 1, B1, C1 and D 1) is presented to the inputs of the flip-flops, and when word select is high word 2 (A 2, B 2, C2 and D2) is presented to the inputs of the flip-flops. The selected word is clocked to the output terminals on the negative edge of the clock pulse. Features • • • • • High Speed Operation: tpd (Clock to Q.

  HD74HC298   HD74HC298






Part Number HD74HC299
Manufacturers Renesas
Logo Renesas
Description 8-bit Universal Shift/Storage Register
Datasheet HD74HC298 DatasheetHD74HC299 Datasheet (PDF)

HD74HC299 8-bit Universal Shift/Storage Register (with 3-state outputs) REJ03D0609–0200 (Previous ADE-205-488) Rev.2.00 Jan 31, 2006 Description The HD74HC299 features multiplexed inputs/outputs to achieve full 8-bit data handling in a single 20-pin package. Due to the large output drive capability and 3-state feature, this device is ideally suited for interfacing with bus lines in a bus oriented system. Two function select inputs and two output control inputs are used to choose the mode of oper.

  HD74HC298   HD74HC298







Part Number HD74HC299
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description 8-bit Universal Shift/Storage Register (with 3-state outputs)
Datasheet HD74HC298 DatasheetHD74HC299 Datasheet (PDF)

HD74HC299 8-bit Universal Shift/Storage Register (with 3-state outputs) Description The HD74HC299 features multiplexed inputs/outputs to achieve full 8-bit data handling in a single 20-pin package. Due to the large output drive capability and 3-state feature, this device is ideally suited for interfacing with bus lines in a bus oriented system. Two function select inputs and two output control inputs are used to choose the mode of operation as listed in the function table. Synchronous parallel .

  HD74HC298   HD74HC298







Part Number HD74HC294
Manufacturers Renesas
Logo Renesas
Description Programmable Frequency Divider/Digital Timer
Datasheet HD74HC298 DatasheetHD74HC294 Datasheet (PDF)

HD74HC292/HD74HC294 Programmable Frequency Divider/Digital Timer REJ03D0608–0200 (Previous ADE-205-486) Rev.2.00 Jan 31, 2006 Description This device divides the incoming clock frequency by a number (a power of 2) that is preset by the Programming inputs. It has two Clock inputs, either of which may be used as a clock inhibit. The device also has an active-low Reset, which initializes the internal flip-flop states. Test Point outputs (TP1, TP2, TP3) are provided with HD74HC292 to facilitate i.

  HD74HC298   HD74HC298







Part Number HD74HC294
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description Programmable Frequency Divider/Digital Timer
Datasheet HD74HC298 DatasheetHD74HC294 Datasheet (PDF)

HD74HC292/HD74HC294 Programmable Frequency Divider/Digital Timer Description This device divides the incoming clock frequency by a number (a power of 2) that is preset by the Programming inputs. It has two Clock inputs, either of which may be used as a clock inhibit. The device also has an active-low Reset, which initializes the internal flip-flop states. Test Point outputs (TP1, TP2, TP3) are provided with HD74HC292 to facilitate incoming inspections. Test Point output is provided with HD74HC2.

  HD74HC298   HD74HC298







Quad. 2-input Multiplexers (with storage)

HD74HC298 Quad. 2-input Multiplexers (with storage) Description This circuit is controlled by the signals word select and clock. When the word select input is taken low word 1 (A 1, B1, C1 and D 1) is presented to the inputs of the flip-flops, and when word select is high word 2 (A 2, B 2, C2 and D2) is presented to the inputs of the flip-flops. The selected word is clocked to the output terminals on the negative edge of the clock pulse. Features • • • • • High Speed Operation: tpd (Clock to Q) = 19 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max Function Table Inputs Word Select L H X H Clock Outputs QA a1 a2 QA0 QB b1 b2 QB0 QC c1 c2 QC0 QD d1 d2 QD0 HD74HC298 Pin Arrangement B2 A2 A1 Data inputs B1 C2 D2 D1 GND 1 2 3 4 5 6 7 8 A2 A1 B1 C2 D2 D1 B2 QA QB QC QD CK WS 16 VCC 15 QA 14 QB Outputs 13 QC 12 QD 11 Clock 10 Word select 9 Data input C1 C1 (Top view) 2 HD74HC298 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 40 µA µA I OL = 4 mA I OL = 5.2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5 — 3.15 — 4.2 — — — — — — — — — — 0.5 1.5 3.15 4.2 — VIL 2.0 4.5 6.0 1.35 — 1.8 — 1.9 .


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