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2 / 12 page December 1990 2 Philips Semiconductors Product specification BCD to 7-segment latch/decoder/driver 74HC/HCT4511 FEATURES • Latch storage of BCD inputs • Blanking input • Lamp test input • Driving common cathode LED displays • Guaranteed 10 mA drive capability per output • Output capability: non-standard • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT4511 are high-speed Si-gate CMOS devices and are pin compatible with “4511” of the “4000B” series. They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT4511 are BCD to 7-segment latch/decoder/drivers with four address inputs (D1 to D4), an active LOW latch enable input (LE), an active LOW ripple blanking input (BI), an active LOW lamp test input (LT), and seven active HIGH segment outputs (Qa to Qg). When LE is LOW, the state of the segment outputs (Qa to Qg) is determined by the data on D1 to D4. When LE goes HIGH, the last data present on D1 to D4 are stored in the latches and the segment outputs remain stable. When LT is LOW, all the segment outputs are HIGH independent of all other input conditions. With LT HIGH, a LOW on BI forces all segment outputs LOW. The inputs LT and BI do not affect the latch circuit. APPLICATIONS • Driving LED displays • Driving incandescent displays • Driving fluorescent displays • Driving LCD displays • Driving gas discharge displays QUICK REFERENCE DATA GND = 0 V; Tamb =25 °C; tr =tf = 6 ns Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD =CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC − 1.5 V SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT tPHL/ tPLH propagation delay CL = 15 pF; VCC =5 V Dn to Qn 24 24 ns LE to Qn 23 24 ns BI to Qn 19 20 ns LT to Qn 12 13 ns CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per latch notes 1 and 2 64 64 pF |
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