74HCT595
Full part number: 74HCT595BQ
Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.
What the 74HCT595 does
The 74HC595 and 74HCT595 are 8-bit serial-in, serial or parallel-out shift registers with output latches and 3-state outputs. These devices support a wide supply voltage range from 2.0 V to 6.0 V and feature a typical shift out frequency of 100 MHz. They include separate clocks for the shift and storage registers, an asynchronous reset input, and inputs with clamp diodes for interfacing to voltages exceeding VCC. The 74HCT595 variant accepts TTL-level inputs, while the 74HC595 uses CMOS levels. Available in multiple packages across commercial and industrial temperature ranges, these parts are typically used for serial-to-parallel data conversion and as remote control holding registers. Their high noise immunity and low power dissipation make them suitable for various digital logic applications requiring data buffering and expansion.
Datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| quiescent current | — | — | 80 µA | VI = VCCor GND; IO = 0 A; VCC = 6.0 V; icc; 8-bit serial-in, serial or parallel-out shift register with output latches; 3-state | Nexperia datasheet, p. 8 — 8-bit serial-in, serial or parallel-out shift register with output l… |
| output current (abs max) | — | — | 25 mA | pin Q7S; io; Limiting values | Nexperia datasheet, p. 6 — Table 4. Limiting values |
| supply voltage range | 5 V | 5.5 V | — | vcc; Recommended operating conditions | Nexperia datasheet, p. 7 — Table 5. Recommended operating conditions |
| operating temperature | 25 °C | 125 °C | — | tamb; Recommended operating conditions | Nexperia datasheet, p. 7 — Table 5. Recommended operating conditions |
| power dissipation (abs max) | — | — | 500 mW | SOT109-1; SOT403-1; SOT763-1; ptot; Limiting values | Nexperia datasheet, p. 6 — Table 4. Limiting values |
| input capacitance | — | 3.5 pF | — | ci; 8-bit serial-in, serial or parallel-out shift register with output latches; 3-state | Nexperia datasheet, p. 8 — 8-bit serial-in, serial or parallel-out shift register with output l… |
| propagation delay | — | 23 ns | 40 ns | MR to Q7S; seeFig. 9; tphl; 74HCT595; VCC = 4.5 V to 5.5 V | Nexperia datasheet, p. 11 — 8-bit serial-in, serial or parallel-out shift register with output… |
| output voltage high | 4.4 V | 4.5 V | — | IO = -20 μA; voh; 74HCT595 | Nexperia datasheet, p. 8 — 8-bit serial-in, serial or parallel-out shift register with output l… |
| output voltage low | — | 0 V | 100 mV | IO = 20 μA; VCC = 2.0 V; vol; 8-bit serial-in, serial or parallel-out shift register with output latches; 3-state | Nexperia datasheet, p. 8 — 8-bit serial-in, serial or parallel-out shift register with output l… |
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Frequently asked questions
What is the input capacitance (ci) of the 74HCT595BQ, an 8-bit serial-in, serial or parallel-out shift register with output latches and 3-state outputs?
The input capacitance (ci) is 3.5 pF.
What is the maximum operating temperature (tamb) according to the recommended operating conditions?
The maximum operating temperature (tamb) is 125 °C.
What is the output current limit for pin Q7S under Limiting values conditions?
The output current is 25 mA.
What is the output voltage high (VOH) when IO = -20 μA for the 74HCT595BQ?
The output voltage high is 4.5 V when IO = -20 μA.
What is the output voltage low (vol) for the 74HCT595BQ when IO = 20 μA and VCC = 2.0 V?
The output voltage low is 0 V.
What is the power dissipation for the 74HCT595BQ in packages SOT109-1, SOT403-1, and SOT763-1 under Limiting values?
The power dissipation is 500 mW.
What is the propagation delay (tphl) from MR to Q7S for the 74HCT595 at VCC = 4.5 V to 5.5 V?
The propagation delay is 23 ns.
What is the quiescent current when VI = VCC or GND, IO = 0 A, and VCC = 6.0 V?
The quiescent current is 80 µA.
What is the supply voltage range (VCC) under Recommended operating conditions?
The supply voltage range is 5.5 V.