Home Logic & voltage translation Flip-flops, latches & registers Counters
Home
Logic & voltage translation
Flip-flops, latches & registers
Counters

CD4045B

ACTIVE

CMOS 21-Stage Counter

Order now
Data sheet

CD4045B

ACTIVE
Data sheet Order now

Product details

Function Counter Bits (#) 2 Technology family CD4000 Supply voltage (min) (V) 3 Supply voltage (max) (V) 18 Input type Standard CMOS Output type Push-Pull Features Balanced outputs, Positive input clamp diode, Standard speed (tpd > 50ns) Operating temperature range (°C) -55 to 125 Rating Catalog
Function Counter Bits (#) 2 Technology family CD4000 Supply voltage (min) (V) 3 Supply voltage (max) (V) 18 Input type Standard CMOS Output type Push-Pull Features Balanced outputs, Positive input clamp diode, Standard speed (tpd > 50ns) Operating temperature range (°C) -55 to 125 Rating Catalog
PDIP (N) 16 181.42 mm² 19.3 x 9.4
  • Very low operating dissipation . . . . . <1 mW (typ.) @ VDD = 5 V, f = 1 MHz
  • Output drivers with sink or source capability . . . . . 7 mA (typ.) @ VDD = 5 V
  • Medium speed (typ.) . . . f = 25 MHz @ VDD = 10 V
  • 100% tested for quiescent current at 20 V
  • 5-V, 10-V, and 15-V parametric ratings
  • Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of 'B' Series CMOS Devices"
  • Applications
    • Digital equipment in which ultra-low dissipation and/or operation using a battery source is required.
    • Accurate timing from a crystal oscillator for timing applications such as wall clocks, table clocks, automobile clocks, and digital timing references in any circuit requiring accurately timed outputs at various intervals in the counting sequence.
    • Driving miniature synchronous motors, stepping motors, or external bipolar transistors in push-pull fashion.
  • Very low operating dissipation . . . . . <1 mW (typ.) @ VDD = 5 V, f = 1 MHz
  • Output drivers with sink or source capability . . . . . 7 mA (typ.) @ VDD = 5 V
  • Medium speed (typ.) . . . f = 25 MHz @ VDD = 10 V
  • 100% tested for quiescent current at 20 V
  • 5-V, 10-V, and 15-V parametric ratings
  • Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of 'B' Series CMOS Devices"
  • Applications
    • Digital equipment in which ultra-low dissipation and/or operation using a battery source is required.
    • Accurate timing from a crystal oscillator for timing applications such as wall clocks, table clocks, automobile clocks, and digital timing references in any circuit requiring accurately timed outputs at various intervals in the counting sequence.
    • Driving miniature synchronous motors, stepping motors, or external bipolar transistors in push-pull fashion.

CD4045B is a timing circuit consisting of 21 counter stages, two output-shaping flip-flops, two inverter output drivers, and input inverters for use in a crystal oscillator. The CD4045B configuration provides 21 flip-flop counting stages, and two flip-flops for shaping the output waveform for a 3.125% duty cycle. Push-pull operation is provided by the inverter output drivers.

The first inverter is intended for use as a crystal oscillator/amplifier. However, it may be used as a normal logic inverter if desired. A crystal oscillator circuit can be made less sensitive to voltage-supply variations by the user of source resistors. In this device, the sources of the p and n transistors have been brought out to package terminals. If external resistors are not required, the sources must be shorted to their respective substrates (Sp to VDD, Sn to VSS). See Fig. 1. The first inverter in conjunction with an outboard inverter, such as 1/6 CD4069, and RX, CX, and RS can also be used to construct an RC oscillator. The following data is supplied as a guide in the selection of values for RX, RS, and CX used in Fig. 11:

  1. RX max = 10 M and CX = 50 pF
  2. CX max = 25 µF with RS = 560 k

The CD4045B types are supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline package (NSR suffix), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).

CD4045B is a timing circuit consisting of 21 counter stages, two output-shaping flip-flops, two inverter output drivers, and input inverters for use in a crystal oscillator. The CD4045B configuration provides 21 flip-flop counting stages, and two flip-flops for shaping the output waveform for a 3.125% duty cycle. Push-pull operation is provided by the inverter output drivers.

The first inverter is intended for use as a crystal oscillator/amplifier. However, it may be used as a normal logic inverter if desired. A crystal oscillator circuit can be made less sensitive to voltage-supply variations by the user of source resistors. In this device, the sources of the p and n transistors have been brought out to package terminals. If external resistors are not required, the sources must be shorted to their respective substrates (Sp to VDD, Sn to VSS). See Fig. 1. The first inverter in conjunction with an outboard inverter, such as 1/6 CD4069, and RX, CX, and RS can also be used to construct an RC oscillator. The following data is supplied as a guide in the selection of values for RX, RS, and CX used in Fig. 11:

  1. RX max = 10 M and CX = 50 pF
  2. CX max = 25 µF with RS = 560 k

The CD4045B types are supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline package (NSR suffix), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).
filter Find other Counters
Download

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
CD74HC4017 ACTIVE High Speed CMOS Logic Decade Counter/Divider with 10 Decoded Outputs Voltage range (2V to 6V), average drive strength (8mA), average propagation delay (20ns)
SN74HC393 ACTIVE Dual 4-bit binary counters Voltage range (2V to 6V), average drive strength (8mA), average propagation delay (20ns)

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Data sheet CD4045B TYPES datasheet (Rev. C) 27 Jun 2003

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​