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Quartz Controlled Pulse Generator
U2391B
Description
The monolithic integrated bipolar circuit, U2391B, is
designed as a quartz controlled pulse generator. The
tristate input enables the selection of different pulse
period durations. The internal switch-on monitoring
achieves the start up of the IC when the power-on occurs.
The output pulse can supply a drive signal upto 150 mA,
which is short circuit protected.
Features
D Standard quartz fosc = 32.768 kHz
D Minimum operating voltage 4.5 V/1.5 mA
D Pulse width, tp = 31.25 ms
D Power stage with current limitation:
typical 150 mA
D Tristate period selection: 1/36/60 s
yD Reset and disable possibility
D Operation with C 33 pF, as operational time
counter possible
D Minimum dimensions due to SO-case
Application
Operational time counter
Case: SO8
Block Diagram
10 mF
wRL 10 x VS in Ohm
390 W
VS = 4.75 to 14 V
60 s
36 s
1s
+
m0.22 F
+
Reset
Interrupt
1
60
Tristate 36
Selection
logic
1
2
Pulse former
3
Programmable
divider
8
Switch on
monitoring
1 Hz
16 Hz
Divider 24
To test
7
Divider 27
Oscillator
6
5 32768 Hz
Reset
4
Tristate Start with VS
Interrupt
Divider 24
2048 Hz
Figure 1. Block diagram with external circuit
96 11740
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
1 (7)

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U2391B
Pin Description
Pin Symbol
Function
1 Period Period selection input
2 GND Ground
3 Output Output control pulse
4 Contr. Control input
5, 6 Osc. Quartz-oscillator input
7 Test Test logic input/output
8 VS Supply voltage
Period
1
8 VS
GND
2
7 Test
Output
3
6 Osc.
Contr.
4 5 Osc.
Figure 2. Pinning
9611805
Description
Pin 1, Period Selection Logic
Period selection at Pin 1 is as follows:
Pin 1 = open,
st = 36
Pin 1 = ground
t=1s
Pin 1 = VS (Pin 8), t = 60 s
Pin 2, Ground
Pin 3, Output Stage
Output stage, being short circuit protected is limited to a
current value of typical 150 mA. Apart from it, there is a
wvoltage limitation which controls the power stage at the
rate of V3 28.8 to 32 V and serves as an active Z-diode.
Output pulse width is 31.25 ms when quartz frequency is
32.768 kHz. It is independent of the selected period.
Pin 4, Control Logic
D Counting delay is typ 1.5 s (maximum 8 s) when Pin 4
is open and VS is switched on.
yD Programmable residual divider t 1 s is reseated if
Pin 4 is connected to Pin 8. This results in an absolute
vtolerance, at the start across “Reset/End” to be 1 s.
D Clock input to the 27 divider is inhibited, if Pin 4 is
vconnected to the ground (Pin 2). Absolute tolerance
for every interruption is 0.488 ms.
ăD An interruption is ignored (Pin 4 = ) during the out-
put pulse time.
*D When Pin 4 is switched to VS during the output pulse
time this output pulse will be reseated.
Pin 5, 6 Quartz-Oscillator Input
The propagated period time selection is based on circuit
with a low cost clock quartz of 32.768 kHz.
Pin 7, Test Logic, Figure 2, 3
To test the circuit in a reasonable time, it is possible to
control the divider (fo = 16 Hz) at Pin 7 as well as to feed
vin a higher frequency to the programmed residual counter
(fi 2 kHz).
Pin 8, Supply Voltage
An operating voltage of 4.5 V is necessary for the func-
tioning of the circuit, although an internal switch-on
monitoring allows it to operate with a voltage of 3.6 V.
This means that there is sufficient reliability for the per-
"formance of the circuit.
The circuit is designed for 12 V 10% with internal sup-
ply voltage limitation of typical 15 V. In case of higher
voltages there is a need of a series resistance and buffer
capacitance as shown in figure 1.
2 (7) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 30-May-96

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Absolute Maximum Ratings
Reference point Pin 2, unless otherwise specified
Parameters
vSupply current
t 10 ms
Pin 8
Supply voltage
without series resistance
Pin 8
Voltages
Selection logic
Control logic
Output stage, without
protection circuit
Pin 1
Pin 4
Pin 3
Currents
Test logic
Oscillator
Output stage
vt 1 ms
Pin 7
Pin 5, 6
Pin 3
Power dissipation
Tamb = 45°C
Tamb = 85°C
Storage temperature range
Ambient temperature range
Junction temperature
U2391B
Symbol
IS
is
VS
V1
V4
V3
I7
Iosc
I3
Ptot
Tstg
Tamb
Tj
Value
30
150
13.2
0 to VS
0 to VS
28.8
± 100
± 100
300
270
135
–40 to +125
–20 to +100
125
Unit
mA
V
V
mA
mA
mA
mW
°C
°C
°C
Electrical Characteristics
VS = 5 V, Tamb = 25°C, figure 1, reference point Pin 2, unless otherwise specified
Parameters
DC supply currents
Minimum supply voltage
Supply voltage limitation
Voltage monitoring
Turn-on threshold
Turn-off threshold
Temperature coefficient
Selection logic
Control logic
Oscillator
Operating current
Build-up time
Test Conditions / Pins Symbol
V8 = 5 V
V8 = 12 V
I8 = 3 mA
I8 = 30 mA
Pin 8
Pin 8
Pin 8
Pin 8
IS
VS
VS
VTON
VTOFF
ăPin 1 = (1 s)
Pin 1 = + (60 s)
–TC
I1
–I1
Pin 4 = 0 V (Interrupt)
Pin 4 = 5 V (Reset)
wReset current
fosc = 32768 Hz, Cosc 33 pF
I4
–I4
–I4
Pin 5, 6
–Iosc
ton
Min.
4.5
13.2
65
Typ.
1.2
15
3.6
2.4
0.33
6
6
45
135
20
1.5
Max.
1.5
2
16.3
17.2
1500
8
Unit
mA
V
V
V
V
%/K
mA
mA
mA
s
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
3 (7)