LS7061

LSI/CSI UL ® LS7061/7063 (631) 271-0400 FAX (631) 271-0405 LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 A3800 Aug. 1998 32 BIT/DUAL 16 BIT BINARY UP COUNTER WITH BYTE MULTIPLEXED THREE-STATE OUTPUTS FEATURES: DC to 15 MHz Count Frequency Byte Multiplexer DC to 1 MHz Scan Frequency +4.75V to +5.25V Operation (VDD-VSS) Latch Provided for External High Speed Counter Byte, Effectively Extending Count Frequency to 3.84GHz Three-State Data Outputs, Bus and TTL Compatible Inputs TTL and CMOS Compatible Unique Cascade Feature Allows Multiplexing of Successive Bytes of Data in Sequence in Multiple Counter Systems LS7061, LS7063 (DIP); LS7061-S, LS7063-S (SOIC) (See Figures 1 & 2) DESCRIPTION: The LS7061/LS7063 is a monolithic, ion implanted MOS Silicon Gate, 32 bit/dual 16 bit up counter. The IC includes 40 latches, multiplexer, eight three-state binary data output drivers and output cascading logic. DESCRIPTION OF OPERATION: 32 (16) BIT BINARY UP COUNTER - LS7061 (LS7063) The 32 (16) bit static ripple through counter increments on the negative edge of the input count pulse. Maximum ripple time is 4µs (2µs) - transition count of 32 (16) ones to 32 (16) zeros. Guaranteed count frequency is DC to 15MHz. See Figure 8A (8B) for Block Diagram. COUNT - LS7061, COUNT A - LS7063 Input count pulses to the 32 (first 16) bit counter may be applied through this input. This input is the most significant bit of the external data byte. COUNT B - LS7063 ...