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LS7272 Datasheet(PDF) 2 Page - LSI Computer Systems |
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LS7272 Datasheet(HTML) 2 Page - LSI Computer Systems |
2 / 6 page 7272-112912-2 NOTE: LS7272-20 does not have OPD pin. INPUT / OUTPUT DESCRIPTION: A / B / C / D These are CMOS / TTL data inputs that can also operate with input levels up to the VDD power supply. All data input blocks contain hysteresis. AO / BO / CO / DO / AO / BO / CO / DO These outputs can be selected to be push-pull or open-drain using the OPD input pin (LS7272 only). When in push-pull mode, outputs switch between VDD and VSS (Ground). ENA A logic low on this CMOS / TTL compatible input enables the output drivers while logic high forces them into a high-impedance state. This input is also used to enable / disable the output short circuit thermal protection. Applying a voltage between 7.5V and 12.5V to the ENA input will disable the thermal shutdown protection function. When using this feature, the Line Driver Outputs are enabled but no longer protected. OPD (LS7272 only) A logic low on this connects the outputs as open-drain drivers. If this input is left floating, the outputs are connected as push-pull drivers. LOW (LS7273 only) This pin must be tied low. 1 4 5 7 8 2 3 6 A AO AO n.c. BO BO n.c. 20 19 18 17 16 15 14 13 VDD D DO CO ENA DO CO C 10 9 12 11 VSS B n.c. VSS n.c. 1 4 5 7 8 2 3 6 A AO AO n.c. BO BO n.c. 20 19 18 17 16 15 14 13 VDD D DO CO ENA DO CO C 10 9 12 11 VSS B n.c. VSS n.c. FIGURE 3 FIGURE 4 |
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