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PDF INS8250 Data sheet ( Hoja de datos )
| Número de pieza | INS8250 | |
| Descripción | PC16450C/NS16450/PC8250A/INS8250A UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER | |
| Fabricantes | National Semiconductor | |
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A Comparison of the
INS8250 NS16450 and
NS16550AF Series of
UARTs
National Semiconductor
Application Note 493
Martin S Michael
April 1989
National currently produces seven versions of the INS8250
UART Functionally these parts appear to be the same
however there are differences that the designer and pur-
chaser need to understand For each version this docu-
ment provides a brief overview of their distinct characteris-
tics a detailed function and timing section a discussion of
software compatibility issues and the AC timing parameters
1 0 Part Summary
The seven versions currently produced are designated
INS8250 INS8250-B INS8250A NS16450 INS82C50A
NS16C450 and NS16550AF These devices are grouped
below by process type
XMOS DEVICES
wants this part should order the NS16550AF Section 5 0
describes the differences between the NS16550 and the
NS16550AF in detail
CMOS DEVICES
1 INS82C50A This is a CMOS version of the INS8250A It
functions identically and for most AC parameters has the
same timing specification as the INS8250A (see Section
4 0) It draws approximately 1 10 (10 mA) of the maxi-
mum operating current of the INS8250A
2 NS16C450 This is a CMOS version of the NS16450 It
functions identically and for most AC parameters has the
same timing specification as the NS16450 (see Section
4 0) It draws approximately 1 12 (10 mA) of the maxi-
mum operating current of the NS16450
1 INS8250 This is the original version produced by Nation-
al It is the same part as the INS8250-B but with faster
CPU bus timings
2 INS8250-B This is the slower speed (CPU bus timing)
version of the INS8250 It is used by many popular 8088-
based microcomputers
Note The XMOS and CMOS UARTs are not plug-in replacements for the
INS8250 INS8250-B when used with ICUs that are in the popular
edge-triggered configuration However there are easily implement-
ed adjustments to the driving software or associated hardware that
will allow these parts to be a plug-in replacement (see Section
6 0)
3 INS8250A This is a revision of the INS8250 using the
more advanced XMOS process The INS8250A is better
than the aforementioned parts due to the redesign (com-
pare section 2 0 to 3 0) and the following process charac-
teristics closer threshold voltage control more reliably
implemented process topography and finer control over
the active area critical dimensions XMOS and CMOS www.DataSheet4U.com
parts should be used for all new designs This part is
used in many popular 8086-based microcomputers
4 NS16450 This is the faster speed (CPU bus timing) ver-
sion of the INS8250A It is used by many popular 80286-
based microcomputers
5 NS16550AF This is the newest member of the UART
family It powers-up in the NS16450 mode and is com-
pletely compatible with all software written for the
NS16450 It has advanced features such as on-board
FIFOs a DMA interface faster CPU bus timings and a
much higher maximum baud rate than the NS16450 The
NS16550AF should be used for all new non-CMOS de-
signs including those that were originally done with the
NS16550 It is used in recent versions of popular 80286-
based 80386-based and ROMP-based microcomputers
Software written for the NS16550 is completely compati-
ble with the NS16550AF Section 5 0 describes how the
software can distinguish between the NS16550 and the
NS16550AF
6 NS16550 This part powers-up in the NS16450 mode and
is completely compatible with all software written for the
NS16450 It has advanced features such as a DMA inter-
face The on-board FIFOs are essentially non-functional
This part was issued on a limited basis Any user that
TL C 9320 – 1
FIGURE 1 Connection Diagram
2 0 INS8250 and INS8250-B
Functional Considerations
Designers using these parts should be aware of the follow-
ing considerations
1 When multiple interrupts are pending the interrupt line
(INTR) pulses low after each interrupt instead of remain-
ing high continuously
Recommendation This will not cause problems in normal
operation however it is a condition necessary for com-
patibility in some popular 8086- and 80286-based micro-
computers that use an edge-triggered ICU (see Section
6 0)
C1995 National Semiconductor Corporation TL C 9320
RRD-B30M105 Printed in U S A
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Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| INS8250 | PC16450C/NS16450/PC8250A/INS8250A UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER | National Semiconductor |
| INS8250A | UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER | National Semiconductor |
| INS8251 | PROGRAMMABLE COMMUNICATION INTERFACE | National Semiconductor |
| INS8255N | PROGRAMMABLE PERIPHERAL INTERFACE | National Semiconductor |
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