LS7030

LSI/CSI UL ® LS7030 (631) 271-0400 FAX (631) 271-0405 December 2002 LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 A3800 8 DECADE MULTIPLEXED COUNTER FEATURES: DC to 7.5 MHz Count Frequency Multiplexed BCD and 7 Segment Outputs DC to 500 kHz Scan Frequency +4.75V to +15V Operation (VDD-VSS) Compatible with CMOS Logic High Input Noise Immunity Counter Output Latches Leading Zero Blanking Low Power Dissipation All inputs protected 40 Pin DIP- See Figure 1 DESCRIPTION: The LS7030 is a monolithic, ion implanted MOS Silicon Gate, 8 decade up counter. The circuit includes latches, multiplexer, leading zero blanking and 7 segment data outputs. 8 DECADE UP COUNTER The eight decade ripple through counter increments on the negative edge of the input count pulse. Maximum ripple time is 12µs (99999999 to 00000000). Maximum count frequency is 7.5MHz. RESET All decades are reset to zero when Reset input is brought low for a minimum of 4µs. The Overflow flip-flop is reset at the same time. Reset must be high for a minimum of 1µs before next valid count can be recorded. LATCHES Contents of counter are transferred to latches when LOAD signal is brought low for a minimum of 4µs and kept low until a minimum of 12µs has elapsed from previous negative edge of count pulse (ripple time). Storage of valid data occurs when LOAD signal is high for a minimum of 1µs before next negative edge of count pulse or reset. Data is transferred for Overflow flip-fl...