CD4521B CMOS 24-Stage Frequency Divider |

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
CMOS 24-Stage Frequency Divider

CMOS 24-Stage Frequency Divider - CD4521B


CD4521B consists of an oscillator section and 24 ripple-carry binary counter stages. The oscillator configuration (using IN1) allows design of either RC or crystal oscillator circuits. IN1 should be tied either HIGH or LOW when not in use. A HIGH on the RESET causes the counter to go to the all-0’s state and disables the oscillator. The count is advanced on the negative transition of IN1 (and IN2). A time-saving test mode is described in the Functional Test Sequence Table and in Fig. 6.

The CD4521B types are supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (M, M96, MT, and NSR suffixes), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).


  • Reset disables the RC oscillator for low-power standby condition
  • VDD’ and VSS’ pins are brought out from the crystal oscillator to allow use of external resistors for low-power operation
  • Maximum input current of 1 µA at 18 V over full package-temperature range:
    100 nA at 18 V and 25°C
  • Common reset
  • 100% tested for 20-V quiescent current
  • 5, 10 and 15 V parametric ratings
  • Standardized symmetrical output characteristics
  • Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of ’B’ Series CMOS Devices"

Data sheet acquired from Harris Semiconductor


Compare all products in Rate multiplier/frequency divider/timer Email Download to Excel
Part number Order 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
CD4521B Order now CD4000     3     18     7     10     8     0.3     4500     4     -4     -55 to 125     No     PDIP | 16
SOIC | 16
SO | 16
TSSOP | 16