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HEF4541B MSI
General description
The HEF4541B is a programmable timer which consists of a 16-stage binary counter, an integrated oscillator to be used with external timing components, an automatic power-on reset and output control logic. The frequency of the oscillator is determined by the external components Rt and Ct within the frequency range 1 Hz to 100 kHz. This oscillator may be replaced by an external clock signal at input RS, the timer advances on the positive-going transition of RS. A LOW on the auto reset input (AR) and a LOW on the master reset input (MR) enables the internal power-on reset. A HIGH level at input MR resets the counter independent on all other inputs. Resetting disables the oscillator to provide no active power dissipation.
A HIGH at input AR turns off the power-on reset to provide a low quiescent power dissipation of the timer. The 16-stage counter divides the oscillator frequency by 28210213 or 216 depending on the state of the address inputs (A0A1 ). The divided oscillator frequency is available at output O. The phase input (PH) features a complementary output signal. If the mode select input (MODE) is LOW or HIGH the timer can be used respectively as a single transition timer or 2n frequency divider.
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| HEF4541BP | HEF4541BPN | 9335 079 80652 | Volume production | SOT27-1
(DIP14) | Bulk Pack, CECC | Standard Marking | HEF4541BP
| Always Pb-free |
| HEF4541BT | HEF4541BT | 9335 080 00512 | Volume production | SOT108-1
(SO14) | Tube Dry Pack | Standard Marking | HEF4541BT
| Always Pb-free |
| HEF4541BT | HEF4541BT-T | 9335 080 00518 | Volume production | SOT108-1
(SO14) | Reel Dry Pack, SMD, 13" | Standard Marking | HEF4541BT
| Always Pb-free |
Products in the above table are all in production. Some variants are discontinued; click here for information on these variants.
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|
| HEF4541BP | 9335 079 80652 | 0.2700 | ASIA | WPI | 250 | 25 | 01/07/2009 | Buy online | Order samples |
| NA | DIGI-KEY CORPORATION | 834 | 1/6/2009 | Buy online | |||||
| NA | FUTURE ELECTRONICS | 1,665 | 1/7/2009 | Buy online | |||||
| NA | MOUSER ELECTRONICS | 1,910 | 1/7/2009 | Buy online | |||||
| HEF4541BT | 9335 080 00512 | 0.2700 | EU | FARNELL | 199 | 1/7/2009 | Buy online | not available | |
| NA | NEWARK | 199 | 1/7/2009 | Buy online | |||||
| HEF4541BT | 9335 080 00518 | 0.2700 | not available |
Parametrics/similar products
| Type number | Package | Description | Fmax(MHz) | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|---|
| HEF4541BP | SOT27-1
(DIP14) | Programmable Timer | 36 @ 15 V | 150@15V | 4.5-15.5 V | 14 | Low Power or Automotive Applications | CMOS | -4/+2.7 mA @ 15 V |
| HEF4541BT | SOT108-1
(SO14) | Programmable Timer | 36 @ 15 V | 150@15V | 4.5-15.5 V | 14 | Low Power or Automotive Applications | CMOS | -4/+2.7 mA @ 15 V |
Similar products
HEF4541B MSI
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