SNx4AHC123A Dual Retriggerable Monostable Multivibrators

1 Features

Operating range 2V to 5.5V V_CC
Schmitt-trigger circuitry on A, B, and CLR inputs for slow input transition rates
Edge triggered from active-high or active-low gated logic inputs
Retriggerable for very long output pulses
Overriding clear terminates output pulse
Glitch-free power-up reset on outputs
Latch-up performance exceeds 100mA per JESD 78, class II

The ’AHC123A devices are dual retriggerable monostable multivibrators designed for 2V to 5.5V V_CC operation.

Device Information

PART NUMBER	PACKAGE⁽¹⁾	PACKAGE SIZE⁽²⁾	BODY SIZE (NOM)⁽³⁾
SNx4AHC123A	DB (SSOP, 16)	6.50mm x 7.8mm	6.50mm x 5.30mm
	PW (TSSOP, 16)	5.00mm x 6.4mm	5.00mm x 4.40mm
	DGV (TVSOP, 16)	3.60mm x 6.4mm	3.60mm x 4.40mm
	N (PDIP, 16)	19.3mm x 9.4mm	19.3mm x 6.35mm
	D (SOIC, 16)	9.00mm x 6mm	9.00mm x 3.90mm

(2) The package size (length × width) is a nominal value and includes pins, where applicable.

(3) The body size (length × width) is a nominal value and does not include pins.

Logic Diagram, Each Multivibrator (Positive Logic)

Figure 3-1 SN54AHC123A J or W Package; SN74AHC123A D, DB, DGV, N, or PW Package; 16-Pin CDIP, CFP, SOIC, SSOP, TVSOP, PDIP, TSSOP (Top View)

Figure 3-2 SN54AHC123A FK Package, 20-Pin LCCC (Top View)

Table 3-1 Pin Functions

PIN		I/O1	DESCRIPTION
NAME	NO.	I/O1	DESCRIPTION
1 A	1	I	Channel 1 falling edge trigger input when 1B = H; Hold low for other input methods
1B	2	I	Channel 1 rising edge trigger input when 1 A = L; Hold high for other input methods
1 CLR	3	I	Channel 1 rising edge trigger when 1 A = L and 1B = H; Hold high for other input methods; Can cut pulse length short by driving low during output
1 Q	4	O	Channel 1 inverted output
2Q	5	O	Channel 2 output
2C_ext	6	—	Channel 2 external capacitor negative connection
2R_ext/C_ext	7	—	Channel 2 external capacitor and resistor junction connection
GND	8	—	Ground
2 A	9	I	Channel 2 falling edge trigger input when 2B = H; Hold low for other input methods
2B	10	I	Channel 2 rising edge trigger input when 2 A = L; Hold high for other input methods
2 CLR	11	I	Channel 2 rising edge trigger when 2 A = L and 2B = H; Hold high for other input methods; Can cut pulse length short by driving low during output
2 Q	12	O	Channel 2 inverted output
1Q	13	O	Channel 1 output
1C_ext	14	—	Channel 1 external capacitor negative connection
1R_ext/C_ext	15	—	Channel 1 external capacitor and resistor junction connection
V_CC	16	—	Power supply