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HEF4538B MSI
General description
The HEF4538B is a dual retriggerable-resettable monostable multivibrator. Each multivibrator has an active LOW trigger/retrigger input (I0 ), an active HIGH trigger/retrigger input (I1 ), an overriding active LOW direct reset input (CD), an output (O) and its complement (O), and two pins (CTC(1) RCTC ) for connecting the external timing components Ct and Rt . Typical pulse width variation over temperature range is ± 02%.
The HEF4538B 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 µs to infinity. The duration and accuracy of the output pulse are determined by the external timing components Ct and Rt . The output pulse width (T) is equal to Rt x Ct . The linear design techniques in LOCMOS guarantee precise control of the output pulse width.
A LOW level at CD terminates the output pulse immediately. Schmitt-trigger action in the trigger inputs makes the circuit highly tolerant to slower rise and fall times.
Note
1) Always connected to ground.
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| HEC4538BT | HEC4538BT | 9352 006 70112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | HEC4538BT
| week 6, 2004 |
| HEC4538BT | HEC4538BT-T | 9352 006 70118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | HEC4538BT
| week 6, 2004 |
| HEF4538BP | HEF4538BPN | 9335 079 50652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | HEF4538BP
| Always Pb-free |
| HEF4538BT | HEF4538BTD | 9335 079 70652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | HEF4538BT
| week 12, 2005 |
| HEF4538BT | HEF4538BTD-T | 9335 079 70653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | HEF4538BT
| week 12, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| HEC4538BT | 9352 006 70112 | 0.4800 | not available | |||||
| HEC4538BT | 9352 006 70118 | 0.4800 | Order samples | |||||
| HEF4538BP | 9335 079 50652 | 0.3200 | NA | DIGI-KEY CORPORATION | 1,322 | 8/28/2008 | Buy online | Order samples |
| NA | MOUSER ELECTRONICS | 811 | 8/28/2008 | Buy online | ||||
| HEF4538BT | 9335 079 70652 | 0.2900 | NA | ARROW ELECTRONICS | 1,084 | 8/27/2008 | Buy online | not available |
| NA | AVNET ELECTRONICS MARKETING | 3,251 | 8/27/2008 | Buy online | ||||
| NA | DIGI-KEY CORPORATION | 705 | 8/28/2008 | Buy online | ||||
| NA | MOUSER ELECTRONICS | 1,200 | 8/28/2008 | Buy online | ||||
| HEF4538BT | 9335 079 70653 | 0.2900 | NA | FUTURE ELECTRONICS | 19,380 | 8/27/2008 | Buy online | Order samples |
| NA | MOUSER ELECTRONICS | 1,942 | 8/28/2008 | 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 |
Similar products
HEF4538B MSI links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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