SC28C94A1N PDF даташит
Спецификация SC28C94A1N изготовлена «NXP Semiconductors» и имеет функцию, называемую «Quad universal asynchronous receiver/transmitter QUART». |
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Детали детали
Номер произв | SC28C94A1N |
Описание | Quad universal asynchronous receiver/transmitter QUART |
Производители | NXP Semiconductors |
логотип |
30 Pages
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INTEGRATED CIRCUITS
SC28C94
Quad universal asynchronous
receiver/transmitter (QUART)
Product specification
1998 Aug 19
Replaces SC26C94 of 1995 May 01 and SC68C94 of 1995 May 01
IC17 Data Handbook
Philips
Semiconductors
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Philips Semiconductors
Product specification
Quad universal asynchronous receiver/transmitter (QUART) SC28C94
DESCRIPTION
The 28C94 quad universal asynchronous receiver/transmitter
(QUART) combines four enhanced Philips Semiconductors
industry-standard UARTs with an innovative interrupt scheme that
can vastly minimize host processor overhead. It is implemented
using Philips Semiconductors’ high-speed CMOS process that
combines small die size and cost with low power consumption.
The operating speed of each receiver and transmitter can be
selected independently at one of eighteen fixed baud rates, a 16X
clock derived from a programmable counter/timer, or an external 1X
or 16X clock. The baud rate generator and counter/timer can
operate directly from a crystal or from external clock inputs. The
ability to independently program the operating speed of the receiver
and transmitter make the QUART particularly attractive for
dual-speed channel applications such as clustered terminal
systems.
Each receiver is buffered with eight character FIFOs (first-in-first-out
memories) and one shift register to minimize the potential for
receiver overrun and to reduce interrupt overhead in interrupt driven
systems. In addition, a handshaking capability is provided to disable
a remote UART transmitter when the receiver buffer is full. (RTS
control)
The 28C94 provides a power-down mode in which the oscillator is
stopped and the register contents are stored. This results in reduced
power consumption on the order of several magnitudes. The
QUART is fully TTL compatible and operates from a single +5V
power supply.
FEATURES
• New low overhead interrupt control
• All commercial parts meet industrial timing and temperature
parameters
• Four Philips Semiconductors industry-standard UARTs
• Eight byte receive FIFO and eight byte transmit FIFO for each
UART
• Programmable data format:
– 5 to 8 data bits plus parity
– Odd, even, no parity or force parity
– 1, 1.5 or 2 stop bits programmable in 1/16-bit increments
• Baud rate for the receiver and transmitter selectable from:
– 23 fixed rates: 50 to 230.4K baud Non-standard rates to 1.0M
baud
– User-defined rates from the programmable counter/timer
associated with each of two blocks
– External 1x or 16x clock
• Parity, framing, and overrun error detection
• False start bit detection
• Line break detection and generation
ORDERING INFORMATION
PACKAGES
48-Pin Plastic Dual In-Line Package (DIP)
52-Pin Plastic Leaded Chip Carrier (PLCC) Package
PIN CONFIGURATIONS
VCC
A5:0
CEN
RDN
WRN
D7-0
RESET
X1/CLK
X2
RDa-d
DACKN
IACKN
RQN
I/O0a–d
I/O1a–d
I/O2a–d
I/O3a–d
TDa-d
VSS
SD00158
Figure 1. Pin Configuration
• Programmable channel mode
– Normal (full-duplex), automatic echo, local loop back, remote
loopback
• Programmable interrupt priorities
• Identification of highest priority interrupt
• Global interrupt register set provides data from interrupting
channel
• Vectored interrupts with programmable vector format
• IACKN and programmable DTACKN signals
• Built-in baud rate generator with choice of 18 rates
• Four I/O pins per UART for modem controls, clocks, etc.
• Power down mode
• High-speed CMOS technology
• 52-pin PLCC and 48-pin DIP
• Commercial and industrial temperature ranges available
• On-chip crystal oscillator
• TTL compatible
• Single +5V power supply with low power mode
• Two multifunction programmable 16-bit counter/timers
• 1MHz 16x mode operation
• 10ns data bus release time
• “Watch Dog” timer for each receiver
INDUSTRIAL
VCC = +5V +10%,
TA = –40oC to +85oC
SC28C94A1N
SC28C94A1A
DWG #
SOT240-1
SOT238-3
1998 Aug 19
2 853–2111 19896
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Philips Semiconductors
Quad universal asynchronous receiver/transmitter (QUART)
Product specification
SC28C94
PIN CONFIGURATIONS
48-Pin Dual-In-Line Package
X1/CLK 1
TXDD 2
RXDD 3
IRQN 4
A5 5
A4 6
A3 7
A2 8
A1 9
A0 10
WRN 11
VSS 12
VCC 13
CEN 14
RDN 15
DACKN 16
IACKN 17
TXDB 18
RXDB 19
D7 20
D6 21
D5 22
D4 23
D3 24
48 X2
47 VSS
46 RESET
45 TXDC
44 RXDC
43 I/O2D
42 I/O1D
41 I/O0D
40 I/O2C
39 I/O1C
38 I/O0C
37 VSS
36 I/O0A
35
I/O1A
34 I/O2A
33 I/O0B
32 I/O1B
31 I/O2B
30 TXDA
29 RXDA
28
D0
27 D1
26 D2
25 VSS
52-Pin PLCC Package
7 6 5 4 3 2 1 52 51 50 49 48 47
RXDB 8
D7 9
D6 10
D5 11
D4 12
D3 13
VSS 14
D2 15
I/O3B 16
D1 17
D0 18
RXDA 19
TXDA 20
46 A5
45 IRQN
44 RXDD
43 TXDD
42 X1/CLK
41 X2
40 VSS
39 I/O3D
38 RESET
37 TXDC
36 RXDC
35 I/O2D
34 I/O1D
21 22 23 24 25 26 27 28 29 30 31 32 33
Figure 2. Pin Configurations (cont.)
SD00159
ABSOLUTE MAXIMUM RATINGS1, 2
SYMBOL
TA
TSTG
VCC
VS
PD
PARAMETER
Operating ambient temperature range3
Storage temperature range
Voltage from VDD to GND4
Voltage from any pin to ground4
Package power dissipation (PLCC52)
Package power dissipation (PDIP48)
RATING
Note 4
–65 to +150
–0.5 to +7.0
–0.5 to VCC +0.5
2.8
3.1
UNIT
_C
_C
V
V
W
W
Derating factor above 25_C (PLCC52)
22 mW/_C
Derating factor above 25_C (PDIP48)
25 mW/_C
NOTES:
1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any other condition above those indicated in the operation section of this specification is not
implied.
2. For operating at elevated temperatures, the device must be derated based on +150°C maximum junction temperature.
3. This product includes circuitry specifically designed for the protection of its internal devices from damaging effects of excessive static
charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying any voltages larger than the rated maxima.
4. Parameters are valid over specified temperature range. See ordering information table for applicable temperature range and operating
supply range.
1998 Aug 19
3
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Номер в каталоге | Описание | Производители |
SC28C94A1A | Quad universal asynchronous receiver/transmitter QUART | NXP Semiconductors |
SC28C94A1N | Quad universal asynchronous receiver/transmitter QUART | NXP Semiconductors |
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