(V = 5 V, R
= 680 kΩ, T = 25° C, unless otherwise specified)
A
GS4981 ELECTRICAL CHARACTERISTICS
CC
SET
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
4.5
5
13.2
6.5
V
Supply Current
Outputs at Logic 1
VCC = 5 V
VCC = 12 V
-
-
4.6
5.0
mA
mA
7.0
Video Input (Pin 2)
(a) Signal Level
VCC = 5 V
0.5
500
9
-
650
11
4
850
13
Vp-p
µA
µA
µA
µs
(b) Clamp Current
Charge
Discharge - normal
- Nosync flag raised
65
64
-
95
115
130
-
(c) Delay to raising of Nosync flag Video input held high
(d) Sync Tip Clamp Voltage
95
1.55
77
V
Sync Slice Level
Relative to sync tip clamp voltage
70
1.14
84
mV
V
RSET Pin Reference Voltage (Pin 6) See Note 1
1.24
1.34
Composite Sync Out (Pin 1)
Delay from Video
See Note 2
40
60
80
ns
C
C
= 15p
= 15p
L
L
Back Porch Pulse Out (Pin 5)
(a) Delay from Rising
Edge of Sync
400
2.0
H
500
2.5
H
650
3.2
H
ns
(b) Pulse Width
µs
(c) Occurence Rate
Vertical Sync Out (Pin 3)
(a) Pulse Width
Serrations during vertical interval
197.7
48
197.7
65
197.7
82
µs
µs
(b) Default Starting Time
Horizontal Sync Out (Pin 7)
(a) Delay from Video
(b) Pulse Width
No serrations during the vertical interval
C
= 15p
L
90
5.0
15
190
7.0
-
290
9.0
ns
µs
Horizontal Scan Rate
Logic Outputs
Modified RSET
130
kHz
(a) V
I
I
= 40 µA
V = 5 V
CC
4.2
11.2
2.4
9.4
-
4.6
11.6
3.4
-
V
V
V
V
V
OH
OH
V
= 12 V
= 5 V
-
-
CC
CC
= 1.6 mA
V
OH
Note 3
= -1.6 mA
V
= 12 V
10.4
0.3
-
CC
(b) V
I
0.6
OL
OL
Note 1: When placing the R
resistor and the 0.1µF decoupling capacitor careful attention should be made to ensure that they are as close
SET
as possible to pin 6. Care should also be taken to avoid parasitic capacitive coupling from any output pin (pins 1, 3, 5 and 7) to pin 6.
Note 2: Measured from slicing point of input falling edge to 50% point of composite sync falling edge.
Note 3: Applies only to composite sync, vertical sync, and back porch outputs. Horizontal sync has a passive 10 kΩ pull-up to V
.
CC
ORDERING INFORMATION
Part Number
GS4981 - CDA
GS4981 - CKA
GS4981 - CTA
GS4981 - IDA
GS4981 - IKA
GS4981 - ITA
Package Type
8 PDIP
Temperature Range
0° to 70° C
8 SOIC
0° to 70° C
8 TAPE
0° to 70° C
8 PDIP
-25° to 85° C
-25° to 85° C
-25° to 85° C
8 SOIC
8 TAPE
520 - 23 - 03
4