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SC68C752B, SC68C752BIB48, SC68C94

Table of contents:
Info of SC68C752B
Info of SC68C752BIB48
Info of SC68C94

SC68C752B, SC68C752BIB48, SC68C94 Selling Leads, Datasheet

MFG:PHILIPS Package Cooled:QFP48 D/C:2009

SC68C752B, SC68C752BIB48, SC68C94 Picture

SC68C752B, SC68C752BIB48, SC68C94 Datasheet download

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Part Number: SC68C752B

MFG: PHILIPS

Package Cooled: QFP48

D/C: 2009

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SC68C752B General Description

The SC68C752B is a dual Universal Asynchronous Receiver/Transmitter (UART) with 64-byte FIFOs, automatic hardware/software flow control, and data rates up to 5 Mbit/s. The SC68C752B offers enhanced features. It has a Transmission Control Register (TCR) that stores receiver FIFO threshold levels to start/stop transmission during hardware and software flow control. With the FIFO Rdy register, the software gets the status of TXRDY/RXRDY for all four ports in one access. On-chip status registers provide the user with error indications, operational status, and modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows on-board diagnostics.

The UART transmits data, sent to it over the peripheral 8-bit bus, on the TX signal and receives characters on the RX signal. Characters can be programmed to be 5 bits, 6 bits, 7 bits, or 8 bits. The UART has a 64-byte receive FIFO and transmit FIFO and can be programmed to interrupt at different trigger levels. The UART generates its own desired baud rate based upon a programmable divisor and its input clock. It can transmit even, odd, or no parity and 1, 1.5, or 2 stop bits. The receiver can detect break, idle, or framing errors, FIFO overflow, and parity errors. The transmitter can detect FIFO underflow. The UART also contains a software interface for modem control operations, and has software flow control and hardware flow control capabilities.

The SC68C752B is available in LQFP48 and HVQFN32 packages.

SC68C752B Maximum Ratings

Symbol	Parameter	Conditions	Min	Max	Unit
VCC	supply voltage		-	7	V
VI	input voltage		-0.3	VCC + 0.3	V
VO	output voltage		-0.3	VCC + 0.3	V
Tamb	ambient temperature	operating in free-air	-40	+85	°C
Tstg	storage temperature		-65	+150	°C

SC68C752B Features

Dual channel with Motorola P interface
Up to 5 Mbit/s data rate
64-byte transmit FIFO
64-byte receive FIFO with error flags
Programmable and selectable transmit and receive FIFO trigger levels for DMA and interrupt generation
Software/hardware flow control
* Programmable Xon/Xoff characters
* Programmable Auto-RTS and Auto-CTS
Optional data flow resume by Xon any character
DMA signalling capability for both received and transmitted data
Supports 5 V, 3.3 V and 2.5 V operation
5 V tolerant inputs
Software selectable baud rate generator

SC68C752B Connection Diagram

SC68C94 General Description

The 68C94 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 68C94 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.

SC68C94 Maximum Ratings

SYMBOL	PARAMETER	RATING	UNIT
T_A	Operating ambient temperature range ²	Note 4
T_STG	Storage temperature range	-65 to +150
V_CC	voltage from V_DD to GND⁴	-0.5 to +7.0	V
V_S	Voltage from any pin to ground⁴	-0.5 to V _CC+0.5	V
P_D	Power dissipation	1	W

SC68C94 Features

• New low overhead interrupt control
• 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
• 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 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
• 30ns data bus release time
• "Watch Dog" timer for each receiver

SC68C94 Connection Diagram

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