Page 1
DS3680
QUAD TELEPHONE RELAY DRIVER
SLRS014C – MARCH 1986 – REVISED SEPTEMBER 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• Designed for –52-V Battery Operation
• 50-mA Output Current Capability
• Input Compatible With TTL and CMOS
• High Common-Mode Input Voltage Range
• Very Low Input Current
• Fail-Safe Disconnect Feature
• Built-in Output Clamp Diode
• Direct Replacement for National DS3680
and Fairchild µA3680
description
The DS3680 telephone relay driver is a monolithic
integrated circuit designed to interface –48-V
relay systems to TTL or other systems in
telephone applications. It is capable of sourcing
up to 50 mA from standard –52-V battery power.
T o reduce the effects of noise and IR drop between
logic ground and battery ground, these drivers are
designed to operate with a common-mode input
range of ±20 V referenced to battery ground. The
common-mode input voltages for the four drivers
can be different, so a wide range of input elements
can be accommodated. The high-impedance
inputs are compatible with positive TTL and
CMOS levels or negative logic levels. A clamp
network is included in the driver outputs to limit
high-voltage transients generated by the relay coil
during switching. The complementary inputs
ensure that the driver output is off as a fail-safe
condition when either output is open.
The DS3680 is characterized for operation from
0°C to 70°C.
IN +
IN –
15 kΩ
OUT
BAT GND
BAT NEG
schematic diagram (each driver)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1 IN+
1 IN–
2 IN–
2 IN+
3 IN+
3 IN–
4 IN–
BAT GND
1 OUT
2 OUT
3 OUT
4 OUT
BAT NEG
4 IN+
D OR N PACKAGE
(TOP VIEW)
symbol (each driver)
BAT GND
+
–
OUT
BAT NEG
IN +
IN –
All resistor values shown are nominal.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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DS3680
QUAD TELEPHONE RELAY DRIVER
SLRS014C – MARCH 1986 – REVISED SEPTEMBER 1995
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range at BAT NEG, V
BAT–
(see Note 1) –70 V to 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range with respect to BAT GND –70 V to 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range with respect to BAT NEG –0.5 V to 70 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input voltage, V
ID
(see Note 2) ±20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current, IO: Resistive load –100 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inductive load –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inductive output load 5 H. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTES: 1. All voltages are with respect to BAT GND, unless otherwise specified.
2. Differential input voltages are at the noninverting input terminal IN+ with respect to the inverting input terminal IN–.
DISSIPATION RATING TABLE
T
≤ 25°C DERATING FACTOR T
= 70°C
PACKAGE
A
POWER RATING ABOVE TA = 25°CAPOWER RATING
D 950 mW 7.6 mW/°C 608 mW
N 1150 mW 9.2 mW/°C 736 mW
recommended operating conditions
MIN MAX UNIT
Supply voltage, V
BAT–
–10 –60 V
Input voltage, either input –20
†
20 V
High-level differential input voltage, V
IDH
2 20 V
Low-level differential input voltage, V
IDL
–20
†
0.8 V
Operating free-air temperature, T
A
0 70 °C
†
The algebraic convention, in which the less positive (more negative) limit is designated minimum, is used in this data sheet for input voltage levels.
electrical characteristics over recommended operating free-air temperature range, V
BA T–
= –52 V
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP‡MAX UNIT
p
VID = 2 V 40 100
IIHHigh-level input current (into IN+)
VID = 7 V 375 1000
µ
A
p
VID = 0.4 V 0.01 5
IILLow-level input current (into IN+)
VID = – 7 V –1 –100
µ
A
V
O(on)
On-stage output voltage IO = 50 mA, VID = 2 V –1.6 –2.1 V
p
VID = 0.8 V –2 –100
I
O(off)
Off-stage output current
V
O
=
V
BAT–
Inputs open –2 –100
µ
A
I
R
Clamp diode reverse current VO = 0 2 100 µA
p
p
IO = 50 mA 0.9 1.2
VOKOutput clamp voltage
IO = –50 mA, V
BAT–
= 0 –0.9 –1.2
V
I
BAT(on)
On-state battery current All drivers on –2 –4.4 mA
I
BAT(off)
Off-state battery current All drivers off –1 –100 µA
‡
All typical values are at TA = 25°C.
Page 3
DS3680
QUAD TELEPHONE RELAY DRIVER
SLRS014C – MARCH 1986 – REVISED SEPTEMBER 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics V
BAT–
= –52 V, TA = 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tonTurn-on time
VID = 3-V pulse, RL = 1 kΩ,
1 10 µs
t
off
Turn-off time
ID
L = 1 H,
L
See Figure 2
1 10 µs
PARAMETER MEASUREMENT INFORMATION
–
+
Load
– 52 V
V
O
– 52 V
BAT NEG
BAT GND
I
O
I
I
V
I
Figure 1. Generalized Test Circuit, Each Driver
–
+
RL = 1 kΩ
L = 1 H
Input
BAT GND
BAT NEG
– 52 V
Output
Input
Output
– 1.5 V
3 V
0 V
≈ – 52 V
V
O(on)
t
off
– 25 V
t
on
– 25 V
TEST CIRCUIT
VOLTAGE WAVEFORMS
Figure 2. Test Circuit and Voltage Waveforms, Each Driver
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DS3680
QUAD TELEPHONE RELAY DRIVER
SLRS014C – MARCH 1986 – REVISED SEPTEMBER 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
3 IN –
3 IN +
4 IN –
4 IN +
2 IN –
2 IN +
1
1 IN+
1 IN –
Control-
Signal
Source
SN74XX
52-V Battery
9 DS3680
1 OUT
2 OUT
3 OUT
4 OUT
12
13
11
10
K1
K1 – K4
50-V Relay Coils – 50 mA MAX
14
BAT GND
BAT NEG
–+
2
3
4
5
6
8
7
K2
K3
K4
Figure 3. Relay Driver
Page 5
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to verify, before placing orders, that information being relied on is current and complete. All products are sold
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TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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Copyright 1998, Texas Instruments Incorporated
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