SCN2651CC1N28 Philips Semiconductors, SCN2651CC1N28 Datasheet
SCN2651CC1N28
Available stocks
Related parts for SCN2651CC1N28
SCN2651CC1N28 Summary of contents
Page 1
... No system clock required 28-pin dual in-line package APPLICATIONS Intelligent terminals Network processors Front-end processors Remote data concentrators Computer to computer links Serial peripherals +5% CC Commercial Industrial + + + +85 C SCN2651CC1N28 Not available 1 Product specification SCN2651 RxC DTR RTS DSR RESET BRCLK TxD TxEMT/DSCHG CTS ...
Page 2
... Philips Semiconductors Programmable communications interface (PCI) BLOCK DIAGRAM DATA BUS D0–D7 (27, 28 (21) RESET OPERATION CONTROL (12) MODE REGISTER (10) MODE REGISTER (13) COMMAND REGISTER R/W (11) STATUS REGISTER CE (20) BRCLK (9) TxC CLOCK CONTROL (25) RxC (22) DSR (16) DCD (17) CTS (23) RTS (24) DTR (18) TxEMT/* DSCHG 1 ABSOLUTE MAXIMUM RATINGS SYMBOL ...
Page 3
... Philips Semiconductors Programmable communications interface (PCI) DC ELECTRICAL CHARACTERISTICS SYMBOL SYMBOL PARAMETER PARAMETER Input voltage V Low IL V High IH Output voltage V Low OL V High OH I Input leakage current IL 3-State output leakage current I Data bus high LH I Data bus low LL I Power supply current ...
Page 4
... Philips Semiconductors Programmable communications interface (PCI) PIN DESCRIPTION Pin No. Symbol 27, 28 5-8 D0 – RESET 12 – R DSR 24 DTR 23 RTS 17 CTS 16 DCD 18 TxEMT/DSCHG 9 TxC 25 RxC 19 TxD 3 RxD 15 TxRDY 14 RxRDY 20 BRCLK GND Table 1. Baud Rate Generator Characteristics Crystal Frequency = 5.0688MHz Theoretical Actual Baud Percent ...
Page 5
... Philips Semiconductors Programmable communications interface (PCI) INTERFACE SIGNALS The PCI interface signals can be grouped into two types: the CPU-related signals (shown in Table 2), which interface the SCN2651 to the microprocessor system, and the device-related signals (shown in Table 3), which are used to interface to the communications device or system. ...
Page 6
... Philips Semiconductors Programmable communications interface (PCI) Table 3. Device-Related Signals PIN INPUT/O PIN NAME NO. UTPUT 5.0688MHz clock input to the internal baud rate generator. Not required if external receiver and BRCLK 20 I transmitter clocks are used. Receiver clock. If external receiver clock is programmed, this input controls the rate at which the character received ...
Page 7
... Philips Semiconductors Programmable communications interface (PCI) required number of accesses are made, the internal sequencer recycles to point at the first register. The pointers are reset to SYN1 register and mode register RESET input or by performing a “read command register” operation, but are unaffected by any other read or write operation ...
Page 8
... Philips Semiconductors Programmable communications interface (PCI) Table 5. Mode Register 1 (MR1) MR17 MR16 MR15 Parity Type Async: Stop bit length 0 = Odd 00 = Invalid 1 = Even Stop bit 1/2 Stop bits Stop bits Sync: Sync: Number of SYN Transparency char control 0 = Double SYN 0 = Normal 1 = Single SYN ...
Page 9
... Philips Semiconductors Programmable communications interface (PCI) Table 8. Status Register (SR) SR7 SR6 SR5 Data Set Data Carrier FE/SYN Ready Detect Detect 0 = DSR input 0 = DCD input Async: is high is high 0 = Normal 1 = DSR input 1 = DCD input 1 = Framing is low is low ERROR Sync Normal 1 = SYN char detected Setting CR4 causes the error flags in the status register (SR3, SR4, and SR5 cleared ...
Page 10
... Philips Semiconductors Programmable communications interface (PCI) character has been loaded into the holding register from the receive shift register and is ready to be read by the CPU. If equal to zero, there is no new character in the holding register. This bit is cleared when the CPU reads the receive data holding register or when the receiver is disabled by CR2 ...
Page 11
... Philips Semiconductors Programmable communications interface (PCI) TIMING DIAGRAMS RESET RESET t RES TRANSMIT 1 BIT TIME (1, 16 CLOCK PERIODS) TxC (INPUT) TxD t TxD t TCS TxC (OUTPUT R – (WRITE) D – FLOATING (READ) 1994 Apr 27 BRCLK, TxC, RxC RxD t TxD RxC (IX) READ AND WRITE t CE ...
Page 12
... Philips Semiconductors Programmable communications interface (PCI) TIMING DIAGRAMS (Continued) TxRDY, TxEMT (Shown for 5-bit characters, no parity, 2 stop bits [in asynchronous mode]) TxC (1X TxD DATA 1 TxEN TxRDY TxEMT CE FOR WRITE OF THR DATA 1 DATA TxD DATA 1 TxEN TxRDY TxEMT CE FOR WRITE OF THR DATA 1 DATA 2 ...
Page 13
... Philips Semiconductors Programmable communications interface (PCI) TIMING DIAGRAMS (Continued) RxRDY (Shown for 5-bit characters, no parity, 2 stop bits [in asynchronous mode]) RxC RxD SYN 1 RxEN SYNDET STATUS BIT RxRDY CE FOR READ READ STATUS RxD DATA 1 RxEN RxRDY OVERRUN STATUS BIT CE FOR READ NOTES: ...
Page 14
... Philips Semiconductors Programmable communications interface (PCI) TYPICAL APPLICATIONS ASYNCHRONOUS INTERFACE TO CRT TERMINAL 8 SCN2651 BRCLK ASYNCHRONOUS INTERFACE TO TELEPHONE LINES 8 SCN2651 BRCLK 1994 Apr 27 ADDRESS BUS CONTROL BUS DATA BUS RxD EIA TO TTL CONVERT (OPT) TxD 5.0688MHz OSCILLATOR ADDRESS BUS CONTROL BUS DATA BUS ...
Page 15
... Philips Semiconductors Programmable communications interface (PCI) TYPICAL APPLICATIONS (Continued) SYNCHRONOUS INTERFACE TO TERMINAL OR PERIPHERAL DEVICE ADDRESS BUS CONTROL BUS DATA BUS SCN2651 SYNCHRONOUS INTERFACE TO TELEPHONE LINES SCN2651 1994 Apr 27 RxD TxD SYNCHRONOUS RxC TERMINAL OR PERIPHERAL TxC DEVICE ADDRESS BUS CONTROL BUS DATA BUS ...