CD4527B CMOS BCD Rate Multiplier |


CMOS BCD Rate Multiplier

CMOS BCD Rate Multiplier - CD4527B


CD4527B is a low-power 4-bit digital rate multiplier that provides an output-pulse rate which is the clock-input-pulse rate multiplied by 1/10 times the BCD input. For example, when the BCD input is 8, there will be 8 output pulses for every 10 input pulses. This device may be used to perform arithmetic operations (add, subtract, divide, raise to a power), solve algebraic and differential equations, generate natural logarithms and trigonometric functions, A/D and D/A conversion, and frequency division.

For fractional multipliers with more than one digit, CD4527B devices may be cascaded in two different modes: the Add mode and the Multiply mode. (See Figs. 12 and 15). In the Add Mode,

Output Rate =
(Clock Rate) [0.1 BCD1 + 0.01 BCD2 + 0.001 BCD3 + . . . ]

In the Multiply mode, the fraction programmed into the first rate multiplier is multiplied by the fraction programmed into the second one,

9 4 36
e.g. × = or 36 output
10 10 100

pulses for every 100 clock input pulses.

The CD4527B types are supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (NSR suffix), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).


  • Cascadable in multiples of 4-bits
  • Set to "9" input and "9" detect output
  • 100% test for quiescent current at 20 V
  • 5-V, 10-V, and 15-V parametric ratings
  • Standardized, symmetrical output characteristics
  • Maximum input current of 1 µA at 18 V over full package-temperature range; 100nA at 18V and 25°C
  • Noise margin (full package-temperature range)=
          1 V at VDD = 5 V
          2 V at VDD = 10 V
         2.5 V at VDD = 15 V
  • Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of 'B' Series CMOS Devices"
  • Applications
    • Numerical control
    • Instrumentation
    • Digital filtering
    • Frequency synthesis

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Parametrics Compare all products in Rate multiplier/frequency divider/timer

Technology Family
VCC (Min) (V)
VCC (Max) (V)
Bits (#)
Voltage (Nom) (V)
F @ nom voltage (Max) (Mhz)
ICC @ nom voltage (Max) (mA)
tpd @ Nom Voltage (Max) (ns)
IOL (Max) (mA)
IOH (Max) (mA)
Operating temperature range (C)
Schmitt Trigger
Package Group
-55 to 125    
PDIP | 16
SO | 16
TSSOP | 16