GS1881 Datasheet, PDF (4/14 Pages) Gennum Corporation – Monolithic Video Sync Separators

GS4981 ELECTRICAL CHARACTERISTICS ^(V_CC^{= 5 V, R}_SET ^{= 680 kΩ, T}_A ^{= 25° C, unless otherwise specified)}
PARAMETER
CONDITIONS
MIN
TYP MAX UNITS
Supply Voltage
Supply Current
Video Input (Pin 2)
Outputs at Logic 1
V_CC = 5 V
V_CC = 12 V
(a) Signal Level
(b) Clamp Current
V_CC = 5 V
Charge
Discharge - normal
- Nosync flag raised
(c) Delay to raising of Nosync flag Video input held high
(d) Sync Tip Clamp Voltage
Sync Slice Level
Relative to sync tip clamp voltage
R_SET Pin Reference Voltage (Pin 6) See Note 1
4.5
-
-
0.5
500
9
65
64
-
70
1.14
5
13.2
4.6
6.5
5.0
7.0
-
650
11
95
95
1.55
77
1.24
4
850
13
115
130
-
84
1.34
V
mA
mA
Vp-p
µA
µA
µA
µs
V
mV
V
Composite Sync Out (Pin 1)
See Note 2
40
60
80
ns
Delay from Video
Back Porch Pulse Out (Pin 5)
(a) Delay from Rising
C_L = 15p
C_L = 15p
Edge of Sync
400
500
650
ns
(b) Pulse Width
2.0
2.5
3.2
µs
(c) Occurence Rate
H
H
H
Vertical Sync Out (Pin 3)
(a) Pulse Width
Serrations during vertical interval
197.7
197.7 197.7
µs
(b) Default Starting Time
No serrations during the vertical interval
48
65
82
µs
Horizontal Sync Out (Pin 7)
(a) Delay from Video
C_L = 15p
90
190
290
ns
(b) Pulse Width
5.0
7.0
9.0
µs
Horizontal Scan Rate
Logic Outputs
Modified R_SET
15
-
130
kHz
(a) V_OH
(b) V_OL
I_OH = 40 µA
I_OH = 1.6 mA
Note 3
I_OL = -1.6 mA
V_CC = 5 V
V_CC = 12 V
V_CC = 5 V
V_CC = 12 V
4.2
4.6
-
V
11.2
11.6
-
V
2.4
3.4
-
V
9.4
10.4
-
V
-
0.3
0.6
V
Note 1: When placing the R_SET resistor and the 0.1µF decoupling capacitor careful attention should be made to ensure that they are as close
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
Package Type
GS4981 - CDA
8 PDIP
GS4981 - CKA
8 SOIC
GS4981 - CTA
8 TAPE
GS4981 - IDA
8 PDIP
GS4981 - IKA
8 SOIC
GS4981 - ITA
8 TAPE
520 - 23 - 03
Temperature Range
0° to 70° C
0° to 70° C
0° to 70° C
-25° to 85° C
-25° to 85° C
-25° to 85° C
4