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DS89C420-ECL Datasheet(PDF) 4 Page - Maxim Integrated Products

Part # DS89C420-ECL
Description  Ultra-High-Speed Microcontroller
Download  58 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS89C420-ECL Datasheet(HTML) 4 Page - Maxim Integrated Products

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Table 1. PIN DESCRIPTION
PIN
DIP
PLCC
TQFP
NAME
FUNCTION
40
12, 44
6, 38
VCC
VCC - +5V
20
1, 22, 23,
34
16, 17,
28, 39
GND
GND. Logic Ground
9
10
4
RST
External Reset. The RST input pin is bidirectional and contains
a Schmitt trigger to recognize external active-high reset inputs.
The pin also employs an internal pulldown resistor to allow for a
combination of wire OR’d external reset sources. An RC is not
required for power-up, since the device provides this function
internally.
18, 19
20, 21
14, 15
XTAL1
XTAL2
XTAL1, XTAL2. The crystal oscillator pins XTAL1 and
XTAL2 provide support for fundamental mode parallel resonant,
AT cut crystals. XTAL1 also acts as an input if there is an
external clock source in place of a crystal. XTAL2 serves as the
output of the crystal amplifier.
29
32
26
PSEN
Program Store Enable. This signal is commonly connected to
optional external program memory as a chip enable. PSEN
provides an active-low pulse and is driven high when external
program memory is not being accessed.
In 1-cycle page mode 1, PSEN remains low for consecutive
page hits.
30
33
27
ALE/ PROG
Address Latch Enable. Functions as a clock to latch the
external address LSB from the multiplexed address/data bus on
Port 0. This signal is commonly connected to the latch enable of
an external 373 family transparent latch. In default mode, ALE
has a pulse width of 1.5 XTAL1 cycles and a period of four
XTAL1 cycles. In page mode, the ALE pulse width is altered
according to the page mode selection. In traditional 8051 mode,
ALE is high when using the EMI reduction mode and during a
reset condition. ALE can be enabled by writing ALEON = 1
(PMR.2). Note that ALE operates independently of ALEON
during external memory accesses. As an alternate mode, this pin
( PROG) is used to execute the parallel program function.


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