Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
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AC Electrical Characteristics
AC Electrical Characteristics of 977P/977W
Parameters
Test Condition
Min.
Type
Max.
154
Units
kHz
Description
fOSC
Oscillator Frequency *
TA= 25°C, R = 200 kW
102
128
fmax-fmin Oscillator Frequency Fluctuation - 977P/977W TA=25°C, VCC= 2.5 ~ 5V
15
kHz
fOSC = 102 to 154 kHz
0.8
1.6
51
1
2
1.2
2.4
77
ms
ms
kHz
s
tFUN
tSTA
fCSC
Cycle Time of Function Code
Cycle Time of Start Code
Carrier Frequency of SC Pin
fOSC = 102 to 154 kHz
fOSC = 102 to 154 kHz
64
8
Pins 1, 4, 5, 6 and 14 are High.
Any of pins 1, 4, 5, 6 or 14 is Low.
6.4
3.2
9.6
4.8
Time of Auto-Power-Off **
tOFF
4
min.
Note: Over the Operating Rating, 0°C £TA £70°C, VCC = 4V
* The relative error between the frequencies of the two on-chip oscillators in the PT8A977P (or 977W) and PT8A978P (or
978LW) must be less than ±25%.
** When adjust the external oscillator resistor, the auto-power-off time will vary relevantly.
AC Electrical Characteristics of 978P/978LW
Test Condition
TA= 25°C, R = 200 kW
TA=25°C, VCC=2.5 ~ 5V
Min.
Type
Max.
154
Units
kHz
Description
Parameters
fOSC
102
128
Oscillator Frequency *
Oscillator Frequency Fluctuation - 978P
15
kHz
kHz
f
max-fmin
Oscillator Frequency Fluctuation - 978LW TA=25°C, VCC=2.0 ~ 5V
10
SI Pin Receive Sensitivity (VPP)
Cycle Time of Function Code
Cycle Time of Start Code
VSI
tFUN
tSTA
Guaranteed Effective Decoding
fOSC = 128 kHz
300
0.75
1.5
mV
ms
ms
1
1.25
fOSC = 128 kHz
2
2.5
Note: Over the Operating Rating, 0°C £TA £70°C, VCC = 4V
* The relative error between the frequencies of the two on-chip oscillators in the PT8A977P (or 977W) and PT8A978P (or
978LW) must be less than ±25%.
PT0074(10/01)
Ver:1
7
PERICOM [ PERICOM SEMICONDUCTOR CORPORATION ]
