DS80C320-QNG+ Dallas Semiconductor, DS80C320-QNG+ Datasheet - Page 3

• Manufacturer Part Number: DS80C320-QNG+
• Description: Microcontroller, 8051 Comp., 4 8-Bit I/O Ports, 64K ROM/RAM, 25 MHz, 5 V, PLCC44
• Manufacturer: Dallas Semiconductor

Specifications of DS80C320-QNG+

• Eeprom Memory: 0 Bytes
• Input Output: 32
• Interface: UART
• Memory Type: ROMless
• Number Of Bits: 8
• Package Type: 44-pin PLCC
• Programmable Memory: 0 Bytes
• Ram Size: 256 Bytes
• Speed: 25 MHz
• Timers: 4-8-bit, 3-16-bit
• Voltage, Range: 4.25-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part

Figure 1. Block Diagram
PIN DESCRIPTION
DIP
18
19
29
40
20
9
PLCC
22, 23
10
20
21
32
PIN
44
TQFP
16, 17
14
15
38
26
4
XTAL2
XTAL1
NAME
GND
RST
PSEN
V
CC
+5V (+3V for DS80C323)
Digital Circuit Ground
Reset Input. The RST input pin contains a Schmitt voltage input to
recognize external active-high reset inputs. The pin also employs an
internal pulldown resistor to allow for a combination of wired OR
external reset sources. An RC is not required for power-up, as the device
provides this function internally.
Crystal Oscillator Pins. XTAL1 and XTAL2 provide support for
parallel-resonant, AT-cut crystals. XTAL1 acts also as an input in the
event that an external clock source is used in place of a crystal. XTAL2
serves as the output of the crystal amplifier.
Program Store-Enable Output, Active Low. This signal is commonly
connected to external ROM memory as a chip enable.
active-low pulse width of 2.25 XTAL1 cycles with a period of four
XTAL1 cycles.
accessed through the bus and during a reset condition.
3 of 40
PSEN
is driven high when data memory (RAM) is being
DS80C320/
DS80C323
FUNCTION
PSEN
provides an