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HEF4538B.pdf
Datasheet
General description
The HEF4538B is a dual retriggerable-resettable monostable multivibrator. Each multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output (nQ) and its complement (nQ), and two pins (nREXT/CEXT, and nCEXT, always connected to ground) for connecting the external timing components CEXT and REXT. Typical pulse width variation over the specified temperature range is +-0.2 pct.
The multivibrator may be triggered by either the positive or the negative edges of the input pulse and will produce an accurate output pulse with a pulse width range of 10 us to infinity. The duration and accuracy of the output pulse are determined by the external timing components CEXT and REXT. The output pulse width (tW) is equal to REXT x CEXT. The linear design techniques in LOCMOS (Local Oxide CMOS) guarantee precise control of the output pulse width. A LOW level at nCD terminates the output pulse immediately. The trigger inputs' Schmitt trigger action makes the circuit highly tolerant of slower rise and fall times.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS, or another input. It is also suitable for use over the industrial (-40 °C to +85 °C) and automotive (-40 °C to +125 °C) temperature ranges.
Features
- Tolerant of slow trigger rise and fall times
- Fully static operation
- 5 V, 10 V, and 15 V parametric ratings
- Standardized symmetrical output characteristics
- Operates across the automotive temperature range -40 °C to +125 °C
- Complies with JEDEC standard JESD 13-B
Products/packages
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| HEF4538BP | HEF4538BP,652 | 9335 079 50652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | |
| HEF4538BT | HEF4538BT,652 | 9335 079 70652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | |
| HEF4538BT | HEF4538BT,653 | 9335 079 70653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking |
Quality/reliability/chemical content
| Type number | Orderable part number | Chemical content | RoHS | Leadfree Conversion date | RHF | IRF (FIT) | MTBF (hours) | MSL Lead-free |
|---|---|---|---|---|---|---|---|---|
| HEF4538BP | HEF4538BP,652 | HEF4538BP |
| Always Pb-free | 2,99 | 3,34E+08 | NA | |
| HEF4538BT | HEF4538BT,652 | HEF4538BT |
| week 12, 2005 | 2,99 | 3,34E+08 | 1 | |
| HEF4538BT | HEF4538BT,653 | HEF4538BT |
| week 12, 2005 | 2,99 | 3,34E+08 | 1 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Orderable part number | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|---|
| HEF4538BP | 9335 079 50652 | HEF4538BP,652 | 0.3200 | NA | NEWARK | 878 | 3/18/2010 | Buy online | Order samples | |
| NA | ARROW ELECTRONICS | 652 | 3/18/2010 | Buy online | ||||||
| EU | FARNELL | 1,407 | 3/18/2010 | Buy online | ||||||
| NA | DIGI-KEY CORPORATION | 1,181 | 3/18/2010 | Buy online | ||||||
| JAPAN | CHIP ONE STOP | yes | 03/19/2010 | Buy online | ||||||
| HEF4538BT | 9335 079 70652 | HEF4538BT,652 | 0.2900 | NA | NEWARK | 476 | 3/18/2010 | Buy online | not available | |
| NA | ARROW ELECTRONICS | 653 | 3/18/2010 | Buy online | ||||||
| EU | FARNELL | 1,394 | 3/18/2010 | Buy online | ||||||
| NA | DIGI-KEY CORPORATION | 1,090 | 3/18/2010 | Buy online | ||||||
| JAPAN | CHIP ONE STOP | no | 03/19/2010 | Buy online | ||||||
| HEF4538BT | 9335 079 70653 | HEF4538BT,653 | 0.2900 | NA | NEWARK | 476 | 3/18/2010 | Buy online | Order samples | |
| NA | ARROW ELECTRONICS | 653 | 3/18/2010 | Buy online | ||||||
| EU | FARNELL | 1,394 | 3/18/2010 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 12,250 | 3/17/2010 | Buy online | ||||||
| JAPAN | CHIP ONE STOP | yes | 03/19/2010 | Buy online |
Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| HEF4538BP | SOT38-4
(DIP16) | Dual Retriggerable Precision Monostable Multivibrator | 60@15V | 4.5-15.5 V | 16 | Low Power or Automotive Applications | CMOS | +/- 2.4 mA @ 15 V |
| HEF4538BT | SOT109-1
(SO16) | Dual Retriggerable Precision Monostable Multivibrator | 60@15V | 4.5-15.5 V | 16 | Low Power or Automotive Applications | CMOS | +/- 2.4 mA @ 15 V |
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