4541.yaml

---
description: "Programmable timer"
package:     DIP
pincount:    14
family:      "4000"
datasheet:   "http://www.standardics.nxp.com/products/hef/datasheet/hef4541b.pdf"
pins:
  - num:  1
    sym:  R__TC
    desc: external resistor connection (R__t)
  - num:  2
    sym:  C__TC
    desc: external capacitor connection (C__t)
  - num:  3
    sym:  RS
    desc: external resistor connection (R__S) or external clock input
  - num:  4
    sym:  NC
    desc: no connection
  - num:  5
    sym:  ~AR
    desc: auto reset input (active low)
  - num:  6
    sym:  MR
    desc: master reset input (active high)
  - num:  7
    sym:  GND
    desc: ground
  - num:  8
    sym:  O
    desc: output
  - num:  9
    sym:  PH
    desc: phase input
  - num:  10
    sym:  MODE
    desc: mode select (single cycle or continuous)
  - num:  11
    sym:  NC
    desc: no connection
  - num:  12
    sym:  A0
    desc: divider input
  - num:  13
    sym:  A1
    desc: divider input
  - num:  14
    sym:  Vcc
    desc: supply voltage
specs:
  - param: Frequency range
    val:   [1 (min), "100k (max)"]
    unit:  Hz
  - param: External capacitor C__t
    val:   100 (min)
    unit:  pF
  - param: External resistor R__t
    val:   [10k (min), 1M (max)]
    unit:  "Ω"
notes:
  - "The RC oscillator frequency is 1/(2.3 × R__t &times C__t). R__S = 2R__t."
  - An external clock signal, connected to RS, may be used instead. The timer advances on the low-to-high transition of RS.
  - "The input frequency is divided by a value determined by A1A0: 2<sup>13</sup> (LL), 2<sup>10</sup> (LH), 2<sup>8</sup> (HL), or 2<sup>16</sup> (HH)."
  - Power-on reset is enabled when ~AR and MR are low. For HEF4541, Vcc should be above 8.5V for correct power-on reset.
  - PH specifies the state of the output after reset (high or low).
  - When MODE is high, the output oscillates continuously.
  - When MODE is low, the output changes only once, after a single cycle.
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