N80C251TB24 Intel, N80C251TB24 Datasheet - Page 6

• Manufacturer Part Number: N80C251TB24
• Description: IC MPU 8-BIT 5V 24MHZ 44-PLCC
• Manufacturer: Intel
• Series: 80Cr

Specifications of N80C251TB24

• Rohs Status: RoHS non-compliant
• Core Processor: MCS 251
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: SIO
• Peripherals: PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Other names: 816721

Contents
FIGURES
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
TABLES
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
vi
8xC251TB/TQ Block Diagram.................................................................................................... 1
The 8xC251TB/TQ Family Nomenclature .................................................................................. 2
8xC251TB/TQ 44-pin PLCC Package........................................................................................ 4
8xC251TB/TQ 40-pin PDIP Packages ....................................................................................... 5
External Bus Cycle: Code Fetch (Nonpage Mode) .................................................................. 18
External Bus Cycle: Data Read (Nonpage Mode) ................................................................... 19
External Bus Cycle: Data Write (Nonpage Mode).................................................................... 20
External Bus Cycle: Code Fetch (Page Mode) ........................................................................ 21
External Bus Cycle: Data Read (Page Mode).......................................................................... 22
External Bus Cycle: Data Write (Page Mode) .......................................................................... 23
External Bus Cycle: Code Fetch/Data Read (Nonpage Mode) ................................................ 24
External Bus Cycle: Data Write (Nonpage Mode).................................................................... 25
External Bus Cycle: Code Fetch/Data Read (Page Mode) ...................................................... 26
External Bus Cycle: Data Write (Page Mode) .......................................................................... 27
Serial Port Waveform — Shift Register Mode .......................................................................... 28
External Clock Drive Waveforms ............................................................................................. 29
AC Testing Input, Output Waveforms....................................................................................... 29
Float Waveforms ...................................................................................................................... 30
Description of Product Nomenclature ........................................................................................2
Proliferation Options .................................................................................................................. 3
Package Information .................................................................................................................. 3
8xC251TB/TQ Pin Assignment .................................................................................................. 6
8xC251TB/TQ PLCC/DIP Pin Assignments Arranged by Functional Category ......................... 7
Signal Descriptions ....................................................................................................................8
Memory Signal Selections (RD1:0) ..........................................................................................10
8xC251TB/TQ Address Map .................................................................................................... 11
DC Characteristics at V
AC Timing Symbol Definitions ..................................................................................................14
AC Characteristics ................................................................................................................... 14
Real-time Wait Timing Symbol Definitions ...............................................................................24
Real-Time Wait AC Timing ....................................................................................................... 27
Serial Port Timing — Shift Register Mode ...............................................................................28
External Clock Drive ................................................................................................................ 29
Thermal Characteristics ........................................................................................................... 30
CC
= 4.5 – 5.5 V ..................................................................................12