4585B RANDE | Alldatasheet

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Technical content

R&E “ INTERNATIONAL, INC. ee

FEATURES

@ Binary or BCD Comparison CONNECTION DIAGRAM @ Expandable (all packages) @ A<B, A=B, A>B Outputs Available INPUTS OUTPUTS INPUTS DESCRIPTION . Voo A3 B83 A>B A<B BO AO Bt This 4-Bit Magnitude Comparator performs 90 8 comparison of straight binary and straight BCD (8-4-2-1) codes. Three decisions about two 4-bit we 15 14 i oes Noo 98 words (A, B) are made and are externally available at three outputs. These devices are fully expand- 12 3s 8 able to any number of bits without external gates. . < Words of greater length may be compared by ek as APB ASB A US connecting comparators in cascade. The A<B and INPUTS | CASCADING A=B outputs of a stage handling less-significant bits output 'NPUTS are connected to the corresponding A<B and A=B inputs of the next stage handling more-significant bits. The A>B cascading input is connected to a high level. The stage handling the least-significant bits must have a high-level voltage applied to the A=B and A>B inputs. An alternate method of cascading which reduces the comparison time is shown under Applications Information. RECOMMENDED OPERATING CONDITIONS For maximum reliability: OC Supply Voltage Vpp-Vsgs 3to15 Vde Operating Temperature = Ta, c 65 to +125 OC E 4010 +85 °C TRUTH TABLE BLUCK DIAGRAM ings PAS 83 Taz, 82 [A1, 61 [A0, 60 [Acs IAB [ A28 [AcB [AB TAD8 | ‘ (A> Blin x x . (AP Shin azd>s2 x oj} 0 ze lice ace] EE] ELLE] 2] 3 : ete . A2=82 | Al=81 o> o ° 10 ao a3 ‘A2z=82 0 1 O 6 " 80 free (ie [tse [ieee LL aL eT ate] | Ss tees ‘A2=82 |Al=81 | AQ<BO oO} 0 . o A2=B2 | A1<B1 ° ° 2 a2 <I a2<e2 x A A 1’ 82 (AS Bout 12 Cox x =x =e =e Toe oT) 16 aa X= Don't Core “ cry Voo = Pin 16 Vgg Pin 8

ELECTRICAL CHARACTERISTICS

STATIC CHARACTERISTICS’ ren [S| re QUIESCENT DF*"'CE CURRF*~ Vin" Vas oF Vow 0.05 150 | wAde All valid input 01 300 combinations 0.2 600 NOTES: | Remaining Static Electrical Characteristics are listed under “4000B Series Family Specifications”.

2 Tow = -65°C for C

= 40°C for E Tuign * +125°C for C = + 85°C for E DYNAMIC CHARACTERISTICS (C, = 50pF, Ts = 25°C) [| raraweren | a | mn | tes | oe | une | 300 600 125 250 80 160 IOUTPUT TRANSITION TIME trom trae 100 200 50 100 40 80 - -L_TTT TTT ote) F| ee a a Ps te et H 5 tH = 10 ee} ft o- YET Pe 354 Y Zam [ | 0 2 4 6 8 10 12 14 16 18 20 Vos. DRAIN VOLTAGE (Vide) Typical N-Channel Sink Current Characteristics LOGIC DIAGRAM a a a wo ryt ! : as —Detpe 1. i : 1 - Dd > Noes 1 wa ppt! ii i 9 ~ —a i 8 { eH De Fac lout ? > Vit il i ar opel pe it in Y>— | 11 ' :

2 Hi | |

a0 | : | (A< Blin \\

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(A*8)j, >> Jout (A>tiine : 1A >Blovt

COMPARISON OF TWO N-BIT WORDS AO Al A2 AZ Aa AS AGB AT An3An-2 An1 An ' ;

1 A=8 4585 AB A=8 4585 A=8 so ASB 4585 Ars

1 A>B 8 A>BENC 14A>8 8 AD>B FNC 14 A>8 8 A>B

80 81 B82 B83 84 65 66 87 Bn.3 Bn-2 Bn-1 Bn wots (mse) B19 3 Als fod B18 ez 4585 ais jaz ay et as This application demonstrates how these magni- B16 eo wel tude comparators can be cascaded to compare hers por longer words. The example illustrated shows the 1 lane comparison of two 20-bit words; however, the ’ are scheme is expandable to n-bits. As an example, one eis ry comparator can be used with five of the 20-bit Als re comparators illustrated to expand the word length B14 jez 4585 to 100-bits. a Jaz 813 a ae Al3 jar a8 a i “ WORD NUMBER o— face LENGTH OF PKGS jo 1-4 bits 1 6-20 bits 26 eu 3 21-100 bits 8-31 All jaz B10 Cy 4585 aio jaz ouruTs B89 ‘! jer ae Bs eo oe as ae 0. acs . 1 jane 1 je ay 86 u As AS Be rv a3. 82 7 Az Br al (LSB) BO NC ao