TC1232 Datasheet, PDF (3/6 Pages) TelCom Semiconductor, Inc – MICROPROCESSOR MONITOR

MICROPROCESSOR MONITOR
1
TC1232
AC ELECTRICAL CHARACTERISTICS: (Cont.) T_A = T_MIN to T_MAX; V_CC = +5V to +10%, unless otherwise
specified.
2
Symbol
Parameter
Test Conditions
Min
Typ
Max Units
t_R
V_CC Rise Time (Note 4)
t_RPD
V_CC Detect to RST High
and RST Low
t_RPU
V_CC Detect to RST High
and RST Open (Note 6)
Figure 6
0
Figure 7, V_CC Falling
—
Figure 8, V_CC Rising
250
NOTES: 1. PB RST is internally pulled up to V_CC with an internal impedance of typically 40kΩ.
2. Measured with outputs open.
3. All voltages referenced to GND.
4. Guaranteed by design.
5. PB RST must be held low for a minimum of 20msec to guarantee a reset.
6. t_R = 5µsec.
—
—
µsec
—
100
nsec
610
1000
msec
3
PIN CONFIGURATIONS
PB RST 1
TD ₂
TOL
3
GND
4
8-Pin PDIP
TC1232CPA
TC1232EPA
8 ^VCC PB RST
1
7 _ST
6 _RST
5 _RST
TD
2
TOL
3
GND
4
8-Pin SOIC
TC1232COA
TC1232EOA
16-Pin SOIC Wide
8
V_CC
NC 1
16 NC
7
ST ^{PB RST 2}
15 V_CC
6 ^RST
5 ^RST
NC 3
TD 4
NC 5
TOL 6
TC1232COE
TC1232EOE
14 NC
13 ST
12 NC
11 RST
NC 7
10 NC
GND 8
9 RST
4
5
PIN DESCRIPTION
Pin No.
Pin No.
Pin No.
(8-Pin PDIP) (8-Pin SOIC) (16-Pin SOIC) Symbol Description
1
1
2
PB RST Push-button Reset Input. A debounced active-low input that ignores
pulses less than 1msec in duration and is guaranteed to recognize inputs
of 20msec or greater.
2
2
4
TD Time Delay Set. The watchdog time-out select input (t_TD = 150msec for
TD = 0V, t_TD = 600msec for TD = open, t_TD = 1.2sec for TD = V_CC).
3
3
6
TOL Tolerance Input. Connect to GND for 5% tolerance or to V_CC for 10%
tolerance.
4
4
8
GND Ground.
5
5
9
RST Reset Output (Active High) - goes active:
1. If V_CC falls below the selected reset voltage threshold
2. If PB RST is forced low
3. If ST is not strobed within the minimum time-out period
4. During power-up
6
6
11
RST Reset Output (Active Low, Open Drain) - see RST.
7
7
13
ST Strobe Input. Input for watchdog timer.
8
8
15
V_CC The +5V Power-Supply Input.
1, 3, 5, 7, 10,
NC No Internal Connection.
12, 14, 16
6
7
8
TELCOM SEMICONDUCTOR, INC.
5-21