SNx4LV221A Dual Monostable Multivibrators with Schmitt-trigger Inputs

1 Features

2V to 5.5V V_CC operation
Max t_pd of 11ns at 5V
Support mixed-mode voltage operation on all ports Schmitt-trigger circuitry on A , B, and CLR inputs for slow input transition rates
Overriding clear terminates output pulse
Glitch-free power-up reset on outputs
I_off supports partial-power-down mode operation
Latch-up performance exceeds 100mA per JESD 78, class II

2 Description

The ’LV221A devices are dual multivibrators designed for 2V to 5.5V V_CC operation. Each multivibrator has a negative-transition-triggered (A) input and a positive-transition-triggered (B) input, either of which can be used as an inhibit input.

Package Information

PART NUMBER	PACKAGE⁽¹⁾	PACKAGE SIZE⁽²⁾	BODY SIZE⁽³⁾
SN74LV221A	DB (SSOP, 16)	6.2mm × 7.8mm	6.2mm × 5.3mm
	DGV (TVSOP, 16)	3.6mm × 6.4mm	3.6mm × 4.4mm
	PW (TSSOP, 16)	5.00mm × 6.4mm	5.00mm × 4.40mm
	NS (SOP, 16)	10.2mm × 7.8mm	10.3mm × 5.30mm
	D (SOIC, 16)	9.9mm × 6mm	9.9mm × 3.90mm

(1) For more information, see Mechanical, Packaging, and Orderable Information.

(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)

3 Pin Configuration and Functions

SN74LV221A SN74LV221A D, DB, DGV, NS, or PW Package;
16-Pin SOIC, SSOP, TVSOP, SOP, or TSSOP (Top View)

Figure 3-1 SN74LV221A D, DB, DGV, NS, or PW Package; 16-Pin SOIC, SSOP, TVSOP, SOP, or TSSOP (Top View)

Table 3-1 Pin Functions

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

(1) I = inputs O = outputs