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PC74HC157PDIL PC74HC157PDIL PC74HC157PDIL Datasheet

Pin No Pin Name Schematic Description
28 B/U Input (B/U) f vcc y J P28 Parabola input via AC coupling cap
1 2 ABL Input (ABL) VCC PI Automatic beam limitation input (control range: 0.5 ~ 4.5V)


PC74HC157PDIL PC74HC157PDIL PC74HC157PDIL Price
8 bits assigned, defined according to the following equations: Let X = value of 8 assigned bits 1) in interlaced mode-scans/frame = 2X 513. Therefore for 525 scans, program X = 6 [000001 10J. Vertical syiic will occur precisely every 262.5 scans, thereby prod ucing two interlaced fields. Range = 513 t0 1 023 scans/irame, odd counts only. 2) in non-interlaced mode-scans/frame = 2X + 256. Therefore tor 262 scans, program X = 3 {00000011). Range = 256 t0 766 scans/frame, even counts only. In either mode, vertical sync width is fixed at three horizontal scans (: 3H).
PC74HC157PDIL PC74HC157PDIL PC74HC157PDIL on stock

Operation Address Used CE CE2 CE2 zz ADV/ LD R/W BWx OE CEN CLK 1/0 Notes
Deselected Cycle, Power-down None H x x L L x x x L LjH High-Z
Deselected Cycle, Power-down None x H x L L x x x L L-yH High-Z
Deselected Cycle, Power-down None x x L L L x x x L L}H High-Z
Continue Deselect Cycle None x x x L H x x x L LjH High-Z 1
READ Cycle (Begin Burst) External L L H L L H x L L LjH Q
READ Cycle (Continue Burst) Next x x x L H x x L L L}H Q 1,7
NOP/Dummy READ (Begin Burst) External L L H L L H x H L L}H High-Z 2
Dummy READ (Continue Burst) Next x x x L H x x H L L-*H High-Z 1,2,7
WRITE Cycle (Begin Burst) External L L H L L L L x L L}H D 3
WRITE Cycle (Continue Burst) Next x x x L H x L x L L-yH D 1,3,7
NOP/WRITE Abort (Begin Burst) None L L H L L L H x L L}H High-Z 2,3
WRITE Abort (Continue Burst) Next x x x L H x H x L LjH High-Z 1,2,3,7
IGNORE Clock Edge (Stall) Current x x x L x x x x H LH 4
SLEEP Mode None X X X H X X X X X X High-Z


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