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IDT54FCT646E Datasheet(PDF) 2 Page - Integrated Device Technology |
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IDT54FCT646E Datasheet(HTML) 2 Page - Integrated Device Technology |
2 / 8 page 7.18 2 IDT54/74FCT646/A/C FAST CMOS OCTAL TRANSCEIVER/REGISTER MILITARY AND COMMERCIAL TEMPERATURE RANGES PIN CONFIGURATIONS LCC TOP VIEW DIP/SOIC/CERPACK TOP VIEW FUNCTION TABLE (2) Inputs Data I/O (1) Operation or Function G G DIR CPAB CPBA SAB SBA A1–A8 B1–B8 IDT54/74FCT646 H X H or L H or L X X Input Input Isolation HX ↑↑ X X Store A and B Data L L X X X L Output Input Real-Time B Data to A Bus L L X H or L X H Stored B Data to A Bus L H X X L X Input Output Real-Time A Data to B Bus L H H or L X H X Stored A Data to B Bus NOTES: 2536 tbl 02 1. The data output functions may be enabled or disabled by various signals at the G or DIR inputs. Data input functions are always enabled, i.e., data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs. 2. H = HIGH, L = LOW, X = Don’t Care, ↑ = LOW-to-HIGH Transition. PIN DESCRIPTION Pin Names Description A1–A8 Data Register A Inputs Data Register B Outputs B1–B8 Data Register B Inputs Data Register A Outputs CPAB, CPBA Clock Pulse Inputs SAB, SBA Output Data Source Select Inputs DIR, G Output Enable Inputs 2536 tbl 01 LOGIC SYMBOL 5 6 7 8 9 10 11 12 GND A1 A2 A3 1 2 3 4 24 23 22 21 20 19 18 17 Vcc 16 15 14 13 CPAB P24-1, D24-1, S024-2 & E24-1 B1 A4 A5 A6 SAB DIR A7 A8 CPBA SBA G B2 B3 B4 B5 B6 B7 B8 2536 drw 06 CPAB SAB DIR CPBA SBA G A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 5 6 7 8 9 10 11 L28-1 25 24 23 22 21 20 19 INDEX 2536 drw 02 B1 G B2 B3 B4 B5 NC A1 A2 A3 A4 A5 A6 NC 12 13 14 15 16 17 18 43 2 1 28 27 26 |
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