CDP1855 Datasheet | Intersil

CDP1855, CDP1855C March 1997 8-Bit Programmable Multiply/Divide Unit Description The CDP1855 and CDP1855C are CMOS 8-bit multiply/divide units which can be used to greatly increase the capabilities of 8-bit microprocessors. They perform multiply and divide operations on unsigned, binary operators. In general, microprocessors do not contain multiply or divide instructions and even efficiently coded multiply or divide subroutines require considerable memory and execution time. These multiply/divide units directly interface to the CDP1800-series microprocessors via the N-lines and can easily be configured to fit in either the memory or I/O space of other 8-bit microprocessors. The multiple/divide unit is based on a method of multiplying by add and shift right operations and dividing by subtract and shift left operations. The device is structured to permit cascading identical units to handle operands up to 32 bits. The CDP1855 and CDP1855C are functionally identical. They differ in that the CDP1855 has a remended operating voltage range of 4V to 10.5V, and the CDP1855C, a remended operating voltage range of 4V to 6.5V. The CDP1855 and CDP1855C types are supplied in a 28 lead hermetic dual-in-line ceramic package (D suffix) and in a 28 lead dual-in-line plastic package (E suffix). The CDP1855C is also available in chip form (H suffix). Features - Cascadable Up to 4 Units for 32-Bit by 32-Bit Multiply or 64 ÷ 32-Bit Divide - 8-Bit by 8-Bit Multiply or 16 ÷ 8-Bit Divide in 5.6µs at 5V or 2.8µs at 10V - Direct Interface to CDP1800-Series Microprocessors - Easy Interface to Other 8-Bit Microprocessors - Significantly Increases Throughput of Microprocessor Used for Arithmetic Calculations Ordering Information PACKAGE TEMP. RANGE PDIP Burn-In SBDIP Burn-In 5V 10V PKG. NO. -40o C to +85o C CDP1855CE CDP1855CEX CDP1855E E28.6 E28.6 -40o C to +85o C CDP1855CD CDP1855D D28.6 CDP1855CDX D28.6 Pinout 28 LEAD DIP TOP VIEW CE 1 CLEAR 2 CTL 3 C.O./O.F. 4 YL 5 ZL 6 SHIFT 7 CLK 8 STB...