ST ST26C32AB User Manual

ST26C32AB

CMOS quad 3-state differential line receiver

Features

■ CMOS design for low power

■ ± 0.2 V sensitivity over input common mode voltage range

■ Typical propagation delay: 19 ns

■ Typical input hysteresis: 60 mV

DIP-16

SO-16

■Input will not load line when VCC = 0 V

■Meets the requirements of EIA standard

RS-422, RS-423

■ 3-state outputs for connection to system buses

■ Available in surface mount

TSSOP16

Description

The ST26C32AB is a quad differential line receiver designed to meet the RS-422, RS-423 standards for balanced and unbalanced digital data transmission, while retaining the low power characteristics of CMOS.

The ST26C32AB has an input sensitivity of 200 mV over the common mode input voltage range of

± 7 V. The ST26C32AB features internal pull-up and pull-down resistors which prevent output oscillation on unused channels. The ST26C32AB provides an enable and disable function to all four receivers and features 3-state output with 6 mA source and sink capability.

Table 1.	Device summary
Order codes		Temperature range	Package	Packaging
ST26C32ABN		-40 to 85 °C	DIP-16	25 parts per tube / 40 tube per box
ST26C32ABDR		-40 to 85 °C	SO-16 (tape and reel)	2500 parts per reel
ST26C32ABTR		-40 to 85 °C	TSSOP16 (tape and reel)	2500 parts per reel
June 2008			Rev 4	1/14
				www.st.com

Contents	ST26C32AB

Contents

1	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
4	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
5	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13

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ST26C32AB	Pin configuration

1 Pin configuration

Figure 1. Pin connections

Table 2.	Pin description
Pin n°		Symbol	Name and function
1		AIN1	Input A1
2		AIN2	Input A2
3		AOUT	Channel A Output
4		EN	ENABLE
5		BOUT	Channel B Output
6		BIN2	Input B2
7		BIN1	Input B1
8		GND	Ground
9		CIN1	Input C1
10		CIN2	Input C2
11		COUT	Channel C output
12		EN	ENABLE
13		DOUT	Channel D output
14		DIN2	Input D2
15		DIN1	Input D1
16		VCC	Supply voltage

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Pin configuration					ST26C32AB
Table 3.	Truth table
	Enable		Enable	Input	Output
	L		H	X	Z
				VID ≥ VTH(MAX)	H
	All other combinations of enable inputs			VID ≤ VTH(MIN)	L
				Open	H
Note:	L = Low voltage state
	H = High logic state
	X = Don’t care
	Z = High impedance

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ST26C32AB	Maximum ratings

2	Maximum ratings
Table 4.	Absolute maximum ratings (1) (2)
Symbol	Parameter	Value	Unit
VCC	Supply voltage	7	V
VCM	Input common mode range	± 14	V
VDIFF	Differential input voltage	± 14	V
VIN	Enable input voltage	7	V
IOMAX	Maximum current per output	± 25	mA
TSTG	Storage temperature range	-65 to +150	°C

1.Absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of electrical characteristics provide conditions for actual device operation.

2.Unless otherwise specified, all voltage are referenced to ground. All currents into the device pins are positive; all currents out of the device pins are negative.

Table 5.	Recommended operating conditions
Symbol	Parameter	Value	Unit
VCC	Supply voltage	4.5 to 5.5	V
TA	Operating temperature range	-40 to +85	°C
tr, tf	Maximum enable input rise or fall times	500	ns

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