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SN74221N

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Texas Instruments Monostable Multivibrators, PDIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74221N

Texas Instruments · Monostable Multivibrators · PDIP-16

SN74221N from Texas Instruments, in a PDIP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1A input Negative-transition-triggered input of multivibrator 1 that can also be used as an inhibit input.
2 1B input Positive-transition-triggered Schmitt-trigger input of multivibrator 1 with TTL hysteresis, typically 1.2 V noise immunity.
3 1CLR input Overriding clear input of multivibrator 1 that terminates the output pulse.
4 ~{1Q} output Complementary output of multivibrator 1, which goes low during the timed output pulse.
5 2Q output Complementary output of multivibrator 2, which goes low during the timed output pulse.
6 2Cext passive External timing capacitor connection for multivibrator 2, with Cext from 0 to 1000 µF per recommended operating conditions.
7 2Rext/Cext passive External timing resistor and capacitor connection for multivibrator 2, with Rext from 1.4 kΩ to 40 kΩ for SN74221.
8 GND power_in Ground reference pin; all unused inputs must be held at VCC or GND for proper operation.
9 2A input Negative-transition-triggered input of multivibrator 2 that can also be used as an inhibit input.
10 2B input Positive-transition-triggered Schmitt-trigger input of multivibrator 2 with TTL hysteresis.
11 2CLR input Overriding clear input of multivibrator 2 that terminates the output pulse.
12 2Q output True output of multivibrator 2, which goes high during the timed output pulse.
13 1Q output True output of multivibrator 1, which goes high during the timed output pulse.
14 1Cext passive External timing capacitor connection for multivibrator 1, with Cext from 0 to 1000 µF per recommended operating conditions.
15 1Rext/Cext passive External timing resistor and capacitor connection for multivibrator 1, with Rext from 1.4 kΩ to 40 kΩ for SN74221.
16 VCC power_in Supply voltage pin, 4.75 V minimum to 5.25 V maximum recommended for SN74221.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package PDIP-16
Category Logic ICs
Pins 16

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage VCC 4.75 5 5.25 V 5
Low-level output current IOL 16 mA 5
High-level output current IOH -800 µA 5
Rise or fall of input pulse rate, B input 1 V/s 5
Rise or fall of input pulse rate, A input 1 V/µs 5
Operating free-air temperature TA 0 70 °C 5
Supply voltage range VCC 7 V 5
Input voltage range VI 5.5 V '221 device 5
Storage temperature range Tstg -65 150 °C 5
Positive-going threshold voltage, B input VT+ 1.55 2 V VCC = MIN 6
Negative-going threshold voltage, B input VT- 0.8 1.35 V VCC = MIN 6
Input clamp voltage VIK -1.5 V VCC = MIN, II = −12 mA 6
High-level output voltage VOH 2.4 3.4 V VCC = MIN, IOH = −800 µA 6
Low-level output voltage VOL 0.2 0.4 V VCC = MIN, IOL = 16 mA 6
Input current at maximum input voltage II 1 mA VCC = MAX, VI = 5.5 V 6
High-level input current, A input IIH 40 µA VCC = MAX, VI = 2.4 V 6
High-level input current, CLR, B input IIH 80 µA VCC = MAX, VI = 2.4 V 6
Low-level input current, A input IIL -1.6 mA VCC = MAX, VI = 0.4 V 6
Low-level input current, CLR, B input IIL -3.2 mA VCC = MAX, VI = 0.4 V 6
Short-circuit output current IOS -55 -18 mA VCC = MAX 6
Quiescent supply current ICC 26 50 mA VCC = MAX 6
Triggered supply current ICC 46 80 mA VCC = MAX 6
Pulse duration, A or B input tw 50 ns 6
Pulse duration, CLR tw 20 ns 6
Setup time, inactive-state (recovery time), CLR tsu 15 ns 6
External timing resistance Rext 1.4 40 kΩ 6
External timing capacitance Cext 0 1000 µF 6
Output duty cycle 67 % Rext = 2 kΩ 6
Output duty cycle 90 % Rext = MAX Rext 6
Propagation delay tPLH, A to Q tPLH 45 70 ns VCC = 5 V, RL = 400 Ω, TA = 25°C 7
Propagation delay tPLH, B to Q tPLH 35 55 ns VCC = 5 V, RL = 400 Ω, TA = 25°C 7
Propagation delay tPHL, A to Q tPHL 50 80 ns VCC = 5 V, RL = 400 Ω, TA = 25°C 7
Propagation delay tPHL, B to Q tPHL 40 65 ns VCC = 5 V, RL = 400 Ω, TA = 25°C 7
Propagation delay tPHL, CLR to Q tPHL 27 ns VCC = 5 V, RL = 400 Ω, TA = 25°C, Cext = 80 pF, Rext = 2 kΩ 7
Propagation delay tPLH, CLR to Q tPLH 40 ns VCC = 5 V, RL = 400 Ω, TA = 25°C, Cext = 80 pF, Rext = 2 kΩ 7
Output pulse width, A or B to Q or Q tw 70 110 150 ns Cext = 80 pF, Rext = 2 kΩ 7
Output pulse width, A or B to Q or Q tw 17 30 50 ns Cext = 0, Rext = 2 kΩ 7
Output pulse width, A or B to Q or Q tw 650 700 750 ns Cext = 100 pF, Rext = 10 kΩ 7
Output pulse width, A or B to Q or Q tw 6.5 7 7.5 ms Cext = 1 µF, Rext = 10 kΩ 7
Package thermal impedance, junction to ambient, N package θJA 67 °C/W per JESD 51-7 5

CAD (KiCad official)

  • Symbol: SN74221N
  • Footprint: Package_DIP:DIP-16_W7.62mm
  • 3D model: PDIP-16 (KiCad packages3D, STEP)
  • 3D model files: sn74221n-etched.step / sn74221n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74221n.step / sn74221n.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (32 pp, sha256 362570aaf7b623a7, retrieved 2026-10-28, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF