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DS2153Q Datasheet(PDF) 6 Page - Dallas Semiconductor |
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DS2153Q Datasheet(HTML) 6 Page - Dallas Semiconductor |
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6 / 52 page  DS2153Q 6 of 52 PIN SYMBOL TYPE DESCRIPTION 18 RCHBLK O Receive Channel Block. A user-programmable output that can be forced high or low during any of the 32 E1 channels. Useful for blocking clocks to a serial UART or LAPD controller in applications where not all E1 channels are used, such as Fractional E1, 384 kbps service (H0), 1920 kbps (H12), or ISDN-PRI. Also useful for locating individual channels in drop-and-insert applications. See Section 13 for timing details. 19 ACLKI I Alternate Clock Input. Upon a receive carrier loss, the clock applied at this pin (normally 2.048 MHz) will be routed to the RCLK pin. If no clock is routed to this pin, then it should be tied to DVSS VIA A 1 k Ω resistor. 20 BTS I Bus Type Select. Strap high to select Motorola bus timing; strap low to select Intel bus timing. This pin controls the function of the RD (DS), ALE(AS), and WR (R/ W ) pins. If BTS=1, then these pins assume the function listed in parenthesis (). 21 22 RTIP RRING - Receive Tip and Ring. Analog inputs for clock recovery circuitry; connects to a 1:1 transformer (see Section 12 for details). 23 RVDD - Receive Analog Positive Supply. 5.0 volts. Should be tied to DVDD and TVDD pins. 24 RVSS - Receive Signal Ground. 0.0 volts. Should be tied to local ground plane. 25 26 XTAL1 XTAL2 - Crystal Connections. A pullable 8.192 MHz crystal must be applied to these pins. See Section 12 for crystal specifications. 27 INT1 O Receive Alarm Interrupt 1. Flags host controller during alarm conditions defined in Status Register 1. Active low, open drain output. 28 INT2 O Receive Alarm Interrupt 2. Flags host controller during conditions defined in Status Register 2. Active low, open drain output. 29 TTIP - Transmit Tip. Analog line driver output; connects to a step-up transformer (see Section 12 for details). 30 TVSS - Transmit Signal Ground. 0.0 volts. Should be tied to local ground plane. 31 TVDD - Transmit Analog Positive Supply. 5.0 volts. Should be tied to DVDD and RVDD pins. 32 TRING - Transmit Ring. Analog line driver outputs; connects to a step-up transformer (see Section 12 for details). |
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