4538.yaml

---
description: "Dual retriggerable precision monostable multivibrator with reset"
package:     DIP
pincount:    16
family:      "4000"
datasheet:   "http://www.standardics.nxp.com/products/hef/datasheet/hef4538b.pdf"
pins:
  - num:  1
    sym:  1CEXT
    desc: external capacitor connection (connect to capacitor and ground)
  - num:  2
    sym:  1REXT/CEXT
    desc: external capacitor/resistor connection
  - num:  3
    sym:  1~CD
    desc: clear direct input (active low)
  - num:  4
    sym:  1B
    desc: input (low-to-high triggered)
  - num:  5
    sym:  1~A
    desc: input (high-to-low triggered)
  - num:  6
    sym:  1Q
    desc: output
  - num:  7
    sym:  1~Q
    desc: complementary output
  - num:  8
    sym:  GND
    desc: ground
  - num:  9
    sym:  2~Q
    desc: complementary output
  - num:  10
    sym:  2Q
    desc: output
  - num:  11
    sym:  2~A
    desc: input (high-to-low triggered)
  - num:  12
    sym:  2B
    desc: input (low-to-high triggered)
  - num:  13
    sym:  2~CD
    desc: clear direct input (active low)
  - num:  14
    sym:  2REXT/CEXT
    desc: external capacitor/resistor connection
  - num:  15
    sym:  2CEXT
    desc: external capacitor connection (connect to capacitor and ground)
  - num:  16
    sym:  Vcc
    desc: supply voltage
specs:
  - param: "External timing resistor R__EXT"
    val:   5 (min)
    unit:  "kΩ"
  - param: "External timing capacitor C__EXT"
    val:   2000 (min)
    unit:  pF
  - param: "Pulse width variation, Vcc = 5V"
    val:   "±0.2"
    unit:  "%"
notes:
  - Connect a timing capacitor C__EXT between nCEXT and nREXT/CEXT.
  - Connect a resistor R__EXT between nREXT/CEXT and Vcc.
  - A high-to-low transition on n~A when nB is low causes a pulse on nQ and n~Q.
  - A low-to-high transition on nB when n~A is high causes a pulse on nQ and n~Q.
  - Setting n~CD low inhibits pulses.
  - "Output pulse width = R__EXT × C__EXT." 
  - "(74HC4538) Output pulse width = 0.7 × R__EXT × C__EXT." 
...