Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 816-8716
製造零件編號74LV165PW,112
BrandNexperia
HK$2.796
/個 (每包:16個)
單位
TSSOP Shift Register 8 74LV Surface Mount - Serial/Parallel to Serial 1 16 1 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 662-6838
製造零件編號CD4015BPWR
HK$3.518
/個 (每包:5個)
單位
TSSOP Shift Register 4 4000 Surface Mount - Serial to Parallel 2 16 3 V 18 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS庫存編號 368-7874
製造零件編號HEF4094BT,652
BrandNexperia
HK$2.93
毎管:50 個
單位
SOIC Shift Register 8 4000 Surface Mount - Serial to Serial/Parallel 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 145-0173
製造零件編號SN74HC393D
HK$2.875
毎管:50 個
單位
SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 186-9050
製造零件編號FS7140-01G-XTD
HK$53.11
毎管:48 個
單位
SOIC Clock Generator - - Surface Mount - Serial - 16 3 V 3.6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 162-6977
製造零件編號CD74HCT40103M96
HK$3.686
個 (在毎卷:2500)
單位
SOIC Counter 8 HCT Surface Mount Binary Down Counter 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 163-0599
製造零件編號MC74HC4040ADTR2G
HK$1.57
個 (在毎卷:2500)
單位
TSSOP Counter 12 MC74 Surface Mount Binary Up Counter 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 663-0373
製造零件編號CD74HC4520E
HK$5.06
/個 (每包:5個)
單位
PDIP Counter 4 HC Through Hole Binary Up Counter 2 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 662-8531
製造零件編號SN74LV595ADR
HK$6.716
/個 (每包:5個)
單位
SOIC Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 145-0394
製造零件編號SN74LS169BN
HK$9.859
毎管:25 個
單位
PDIP Counter 4 LS Through Hole Binary Down Counter, Up Counter 1 16 4.75 V 5.25 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 662-9789
製造零件編號CD74AC164M
HK$5.672
/個 (每包:5個)
單位
SOIC Shift Register 8 AC Surface Mount - Serial to Parallel 1 14 1.5 V 5.5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 528-202
製造零件編號SN74HC4020D
HK$3.928
/個 (每包:20個)
單位
SOIC Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 809-5677
製造零件編號SN74LV4040AN
HK$10.339
/個 (每包:25個)
單位
PDIP Counter 12 LV Through Hole Binary Up Counter 1 16 2 V 5.5 V 19.69 x 6.6 x 4.57mm 19.69mm 6.6mm
RS庫存編號 163-0598
製造零件編號MC74HC4020ADR2G
HK$1.43
個 (在毎卷:2500)
單位
SOIC Counter 14 MC74 Surface Mount Binary Up Counter 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm